EP0538929B1 - Flow rectifier - Google Patents
Flow rectifier Download PDFInfo
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- EP0538929B1 EP0538929B1 EP92203062A EP92203062A EP0538929B1 EP 0538929 B1 EP0538929 B1 EP 0538929B1 EP 92203062 A EP92203062 A EP 92203062A EP 92203062 A EP92203062 A EP 92203062A EP 0538929 B1 EP0538929 B1 EP 0538929B1
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- 239000012530 fluid Substances 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000007547 defect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
Definitions
- the present invention relates to an apparatus known as a flow rectifier intended to be mounted on a pipe traversed by a fluid in order to obtain a flow having no vortex capable of disturbing possible flow or other measurements.
- a first defect comes from the asymmetry in the distribution of the velocities of the fluid in a plane perpendicular to the direction of flow.
- Such asymmetry is for example caused by a bend in the pipe or by the shutter of a semi-closed valve, for example a wedge valve.
- Another defect consists in the existence of vortices coaxial with the pipe which can as well arise spontaneously during the flow of the fluid as after the crossing of a half-closed valve as previously.
- honeycomb Another device, known as a honeycomb, comprising a large number of tubes arranged longitudinally, in a cylindrical chamber mounted on the pipe.
- a honeycomb device In addition to the fact that the manufacture and assembly of such a structure are expensive, a honeycomb device has, as previously, a significant longitudinal extension.
- star rectifier which comprises a cylindrical chamber mounted on the pipe and in which walls are regularly mounted so as to materialize, in section, four or more diameters.
- This device operates in a manner substantially similar to the honeycomb device and has the same drawbacks.
- fins are mounted on the inside of the pipe and parallel to its axis. They aim to transform the overall rotation into four marginal vortices. No device of fins creating vortices counter-rotating compared to the preceding ones is envisaged (leaving the possibility to the secondary marginal vortices to recompose to restore a flow of rotation in the opposite direction). The longitudinal extension of these fins is deemed to be of two pipe diameters.
- each fin Downstream of this first series of fins are mounted four fins on the inner face of the pipe perpendicular to the axis of the pipe and making an angle of 30 ° with a meridian of the pipe.
- Each fin covers a part of about 1/8 of the circumference of the pipe and the radial extension of its projection on the axis of the pipe is about 1/6 of the diameter.
- this device creates a turbulent mixture dissipating energy taken from the axial component of the speed of the fluid resulting in a significant dynamic pressure drop.
- This device has a longitudinal extension of about four times the diameter of the pipe, therefore significant.
- Document FR-A-2 306 356 discloses a flow rectifier in accordance with the preamble of claim 1, intended to be mounted on a pipe with a circular section traversed by a highly viscous liquid and which comprises, for example two plates arranged transversely to the direction of flow, offset with respect to each other and each made up of annular bands of increasing diameters arranged at regular intervals on a grid.
- the strips are provided with wall elements which project perpendicular to the direction of flow in the intervals between the various annular strips and which are turned outwards.
- the annular bands are also provided, in a similar manner, with wall elements which, this time, all face inward.
- Such a rectifier makes it possible to homogenize the flow by locally creating random disturbances but does not make it possible to destroy the structures vortices of longitudinal axis present in the flow over a very short longitudinal distance.
- the subject of the invention is therefore a flow straightener intended to regulate the profile of the speeds of a flow of fluid in a pipe and this over a very short distance compared to the diameter of this pipe thus making it possible to reduce the size of a measuring set.
- the invention makes it possible to regularize the speed profile without imposing a significant pressure drop coefficient.
- the invention relates to a flow straightener intended to be mounted on a pipe with circular section traversed by a fluid and comprising, in a ring, first means for creating a first series of transverse vortices all having a first direction of rotation, second means for creating a second series of transverse vortices all having a direction of rotation opposite to the first direction of rotation and paired with the vortices created by the first means, as defined in claim 1.
- the device according to the invention therefore makes it possible to transform a main vortex present in the flow into a multitude of vortices of reduced dimensions.
- Neighboring vortices moving in opposite directions tend to annihilate each other which increases efficiency and decreases the distance at the end of which the flow is regularized.
- the vortices of the first and second series are substantially distributed in a peripheral ring of the ring.
- the rotational speed of the vortex fluid increases from the center to the inner edge of the pipe.
- the first means for creating a first series of vortices comprise a first series of fins oriented radially and regularly distributed over the internal surface of the ring.
- the second means for creating a second series of vortices comprise a second series of radially oriented fins, arranged along a circumference centered on the center of the ring.
- the second series of fins leaves an axial circular passage free.
- the first means for creating a first series of vortices include a first series of fins oriented radially and regularly distributed over the internal surface of the ring, and the second means for creating a second series of vortices a circular support centered on the center of the ring the circular support delimiting an axial passage, a second series of fins oriented radially regularly distributed on the circular support and pointing towards the internal surface of the ring, the fins of the second series being angularly offset with respect to the fins of the first series.
- the first series of fins is contained in a peripheral ring and the ends of the fins of the second series penetrate this peripheral ring.
- the rectifier comprises internal fins fixed on the circular support and extending in the axial passage.
- these internal fins are extensions of the fins of the second series.
- the rectifier 1 comprises a ring 10 capable of being mounted on the pipe in which the flow to be regulated circulates.
- a first series of fins 12 is regularly arranged, radially, on the internal face of the ring 10.
- D corresponding to the diameter of the pipe (not shown) and in this embodiment to the inside diameter of the ring 10, the fins for example have a length of 0.15 D and a longitudinal extension of 0.2 D.
- a second series of fins 14a is arranged regularly and radially on a circular support 16 centered on the center of the ring 10.
- each fin 14a of the second series is arranged midway between two neighboring fins 12.
- each fin 14a of the second series enters the crown delimited by the ends of the fins 12 of the first series.
- the circular support 16 delimits an axial passage 18 of diameter equal for example to 0.6 D.
- This passage 18 internal fins 14b, extensions of the fins 14a of the second series, point towards the center of the ring 10.
- the fins 14a of the first series have for example a length of 0.075 D and a longitudinal extension of 0.2 D.
- the internal fins 14b have in this configuration a length and a longitudinal extension identical to the previous ones.
- the circular support 16 is fixed to the internal face of the ring by means of four fasteners 20.
- the fasteners 20 regularly distributed over the circumference of the ring, take the place of a fin 14a.
- the ring 10, the support 16, the fasteners 20, the fins 12, 14a, 14b are made of molded plastic or any other material capable of withstanding the stresses induced by the flow.
- a marginal vortex of opposite direction of rotation is formed at the end of each fin 12 of the first series relative to that of the incident vortex.
- each fin 14a of the second series It also forms at the end of each fin 14a of the second series, a marginal vortex of opposite direction of rotation relative to the direction of rotation of the vortices created by the first series of fins.
- the number of fins is chosen to be sufficient to obtain the desired effect; in the realization represented in FIG. 1, there are twelve fins of the first series for eight fins 14a of the second series, four of the latter being replaced by fixings 20.
- the device of the invention of extremely small longitudinal extension, approximately 0.2 D, and having a low pressure drop coefficient, of the order of 0.1, makes it possible to regulate a flow of fluid after a short distance traveled after the rectifier, about 1.5 D.
Abstract
Description
La présente invention est relative à un appareil dit redresseur de flux destiné à être monté sur une conduite parcourue par un fluide en vue d'obtenir un écoulement ne présentant pas de tourbillon capable de perturber d'éventuelles mesures de débit ou autre.The present invention relates to an apparatus known as a flow rectifier intended to be mounted on a pipe traversed by a fluid in order to obtain a flow having no vortex capable of disturbing possible flow or other measurements.
Il existe en fait deux types de défaut que peut présenter un écoulement et qui sont gênants pour effectuer des mesures, en particulier de débit.There are in fact two types of defect that can present a flow and which are troublesome to carry out measurements, in particular of flow.
Un premier défaut provient de la dissymétrie dans la distribution des vitesses du fluide dans un plan perpendiculaire à la direction de l'écoulement. Une telle dissymétrie est par exemple provoquée par un coude de la conduite ou par l'obturateur d'une vanne à demi-fermée, par exemple une vanne à coin.A first defect comes from the asymmetry in the distribution of the velocities of the fluid in a plane perpendicular to the direction of flow. Such asymmetry is for example caused by a bend in the pipe or by the shutter of a semi-closed valve, for example a wedge valve.
Un autre défaut consiste dans l'existence de tourbillons coaxiaux à la conduite qui peuvent aussi bien prendre naissance spontanément au cours de l'écoulement du fluide qu'après la traversée d'une vanne à demi-fermée comme précédemment.Another defect consists in the existence of vortices coaxial with the pipe which can as well arise spontaneously during the flow of the fluid as after the crossing of a half-closed valve as previously.
En fait, un type de défaut n'existe jamais isolément, mais les deux défauts sont toujours présents conjointement dans les turbulences qui agitent le fluide.In fact, one type of defect never exists in isolation, but the two faults are always present jointly in the turbulence which agitates the fluid.
On connait plusieurs dispositifs qui permettent de régulariser le profil des vitesses d'un écoulement de fluide dans la conduite.Several devices are known which make it possible to regularize the profile of the speeds of a flow of fluid in the pipe.
On a, par exemple, proposé de placer dans la conduite une chambre cylindrique comprenant des nervures longitudinales disposées régulièrement sur la surface interne de la chambre. Ces nervures possèdent une extension radiale croissante dans le sens de l'écoulement. Ce type de dispositif présente l'inconvénient majeur de posséder une extension longitudinale importante, de l'ordre de 4 à 5 fois le diamètre de la conduite d'arrivée. Cette extension longitudinale est nécessaire pour obtenir une bonne régularisation de l'écoulement. Mais on comprend qu'elle augmente de façon défavorable l'encombrement nécessaire à l'ensemble de mesure.It has, for example, been proposed to place in the pipe a cylindrical chamber comprising longitudinal ribs regularly arranged on the internal surface of the chamber. These ribs have an increasing radial extension in the direction of flow. This type of device has the major drawback of having a large longitudinal extension, of the order of 4 to 5 times the diameter of the inlet pipe. This longitudinal extension is necessary to obtain good regularization of the flow. But it is understood that it unfavorably increases the space required for the measuring assembly.
On connait un autre dispositif, dit à nid d'abeille comprenant un grand nombre de tubes disposés longitudinalement, dans une chambre cylindrique montée sur la conduite.Another device, known as a honeycomb, is known, comprising a large number of tubes arranged longitudinally, in a cylindrical chamber mounted on the pipe.
Outre le fait que la fabrication et le montage d'une telle structure sont onéreux, un dispositif à nid d'abeille possède, de même que précédemment, une extension longitudinale importante.In addition to the fact that the manufacture and assembly of such a structure are expensive, a honeycomb device has, as previously, a significant longitudinal extension.
On connait aussi un dispositif, dit redresseur en étoile, qui comporte une chambre cylindrique montée sur la conduite et dans laquelle des parois sont montées régulièrement de manière à matérialiser, en coupe, quatre diamètres ou plus. Ce dispositif fonctionne de manière sensiblement similaire au dispositif à nid d'abeille et présente les mêmes inconvénients.There is also known a device, called star rectifier, which comprises a cylindrical chamber mounted on the pipe and in which walls are regularly mounted so as to materialize, in section, four or more diameters. This device operates in a manner substantially similar to the honeycomb device and has the same drawbacks.
Ces différents dispositifs sont passés en revue dans l'ouvrage de R.W. Miller, "Flow measurement engineering handbook", Mc Graw Hill, New York, 1989.These different devices are reviewed in the work by R.W. Miller, "Flow measurement engineering handbook", Mc Graw Hill, New York, 1989.
L'article de K. Akaski et autres, "Development of a new flow rectifier for shortening upstream straight pipe length of flowmeters", IMEKO Tokyo, SIC, 12b-5, pp 279-284 (1979) décrit un dispositif beaucoup moins encombrant. Il s'agit d'une simple plaque percée de trous de diamètre constant et suivant une distribution spatiale donnée. Si ce dispositif est compact, il présente néanmoins l'inconvénient de posséder un coefficient de perte de charge élevé de l'ordre de 2. La chute de pression inévitable au passage de l'écoulement par la plaque entraîne une perte d'énergie importante.The article by K. Akaski and others, "Development of a new flow rectifier for shortening upstream straight pipe length of flowmeters", IMEKO Tokyo, SIC, 12b-5, pp 279-284 (1979) describes a much less cumbersome device. It is a simple plate pierced with holes of constant diameter and following a given spatial distribution. If this device is compact, it nevertheless has the drawback of having a high pressure drop coefficient of the order of 2. The inevitable pressure drop when the flow passes through the plate results in a significant loss of energy.
L'article de C.R. SMITH et autres "Using passive vortex generation devices", 5th International IMEKO Conference on Flow Measurement - Düsseldorf 1989, décrit un dispositif comprenant deux séries d'ailettes destinées à régulariser l'écoulement.The article by C.R. SMITH and others "Using passive vortex generation devices", 5th International IMEKO Conference on Flow Measurement - Düsseldorf 1989, describes a device comprising two series of fins intended to regulate the flow.
Quatre ailettes sont montées sur la face intérieure de la conduite et parallèlement à son axe. Elles ont pour but de transformer la rotation d'ensemble en quatre tourbillons marginaux. Aucun dispositif d'ailettes créant des tourbillons contrarotatif par rapport aux précédents n'est envisagé (laissant la possibilité aux tourbillons marginaux secondaires de se recomposer pour rétablir un écoulement de rotation dans le sens inverse). L'extension longitudinale de ces ailettes est réputée être de deux diamètres de conduite.Four fins are mounted on the inside of the pipe and parallel to its axis. They aim to transform the overall rotation into four marginal vortices. No device of fins creating vortices counter-rotating compared to the preceding ones is envisaged (leaving the possibility to the secondary marginal vortices to recompose to restore a flow of rotation in the opposite direction). The longitudinal extension of these fins is deemed to be of two pipe diameters.
A l'aval de cette première série d'ailettes sont montées quatre ailettes sur la face intérieure de la conduite perpendiculairement à l'axe de la conduite et faisant un angle de 30° avec une méridienne de la conduite. Chaque ailette couvre une partie d'environ 1/8 de la circonférence de la conduite et l'extension radiale de sa projection sur l'axe de la conduite est d'environ 1/6 du diamètre.Downstream of this first series of fins are mounted four fins on the inner face of the pipe perpendicular to the axis of the pipe and making an angle of 30 ° with a meridian of the pipe. Each fin covers a part of about 1/8 of the circumference of the pipe and the radial extension of its projection on the axis of the pipe is about 1/6 of the diameter.
A l'embase de chacune des ailettes un tourbillon "en épingle à cheveux" d'axe longitudinal est crée quelque soit la rotation d'ensemble de l'écoulement, entraînant un intense brassage turbulent qui a pour objet de régulariser la distribution de vitesse axiale.At the base of each of the fins a "hairpin" vortex with a longitudinal axis is created whatever the overall rotation of the flow, causing intense turbulent stirring whose purpose is to regularize the axial speed distribution. .
Pour redresser l'écoulement, ce dispositif crée un mélange turbulent dissipant une énergie prélevée sur la composante axiale de la vitesse du fluide entraînant une chute de pression dynamique non négligeable.To straighten the flow, this device creates a turbulent mixture dissipating energy taken from the axial component of the speed of the fluid resulting in a significant dynamic pressure drop.
Ce dispositif possède une extension longitudinale d'environ quatre fois le diamètre de la conduite, donc importante.This device has a longitudinal extension of about four times the diameter of the pipe, therefore significant.
On connaît, d'après le document FR-A-2 306 356, un redresseur de flux conforme au préambule de la revendication 1, destiné à être monté sur une conduite à section circulaire parcourue par un liquide fortement visqueux et qui comprend par exemple deux plaques disposées transversalement à la direction d'écoulement, décalées l'une par rapport à l'autre et constituées chacune de bandes annulaires de diamètres croissants disposées à intervalles réguliers sur une grille.Document FR-A-2 306 356 discloses a flow rectifier in accordance with the preamble of claim 1, intended to be mounted on a pipe with a circular section traversed by a highly viscous liquid and which comprises, for example two plates arranged transversely to the direction of flow, offset with respect to each other and each made up of annular bands of increasing diameters arranged at regular intervals on a grid.
Sur la première plaque, les bandes sont munies d'éléments de paroi qui font saillie perpendiculairement à la direction d'écoulement dans les intervalles compris entre les diverses bandes annulaires et qui sont tournés vers l'extérieur.On the first plate, the strips are provided with wall elements which project perpendicular to the direction of flow in the intervals between the various annular strips and which are turned outwards.
Sur la deuxième plaque, les bandes annulaires sont également munies, de façon analogue, d'éléments de paroi qui, cette fois-ci, sont tous tournés vers l'intérieur.On the second plate, the annular bands are also provided, in a similar manner, with wall elements which, this time, all face inward.
Un tel redresseur permet d'homogénéiser l'écoulement en créant localement des perturbations aléatoires mais ne permet pas de détruire les structures tourbillonnaires d'axe longitudinal présentes dans l'écoulement sur une très courte distance longitudinale.Such a rectifier makes it possible to homogenize the flow by locally creating random disturbances but does not make it possible to destroy the structures vortices of longitudinal axis present in the flow over a very short longitudinal distance.
L'invention a donc pour objet un redresseur de flux destiné à régulariser le profil des vitesses d'un écoulement de fluide dans une conduite et ceci sur une très courte distance comparée au diamètre de cette conduite permettant ainsi de diminuer l'encombrement d'un ensemble de mesure.The subject of the invention is therefore a flow straightener intended to regulate the profile of the speeds of a flow of fluid in a pipe and this over a very short distance compared to the diameter of this pipe thus making it possible to reduce the size of a measuring set.
En outre, l'invention permet de régulariser le profil des vitesses sans imposer un coefficient de perte de charge important.In addition, the invention makes it possible to regularize the speed profile without imposing a significant pressure drop coefficient.
De manière plus précise, l'invention concerne un redresseur de flux destiné à être monté sur une conduite à section circulaire parcourue par un fluide et comprenant, dans un anneau, des premiers moyens pour créer une première série de tourbillons transversaux ayant tous un premier sens de rotation, des seconds moyens pour créer une seconde série de tourbillons transversaux ayant tous un sens de rotation inverse du premier sens de rotation et appariés avec les tourbillons créés par les premiers moyens, tel que défini dans la revendication 1.More specifically, the invention relates to a flow straightener intended to be mounted on a pipe with circular section traversed by a fluid and comprising, in a ring, first means for creating a first series of transverse vortices all having a first direction of rotation, second means for creating a second series of transverse vortices all having a direction of rotation opposite to the first direction of rotation and paired with the vortices created by the first means, as defined in claim 1.
Le dispositif conforme à l'invention permet donc de transformer un tourbillon principal présent dans l'écoulement en une multitude de tourbillons de dimensions réduites.The device according to the invention therefore makes it possible to transform a main vortex present in the flow into a multitude of vortices of reduced dimensions.
Les tourbillons voisins évoluant en sens inverse l'un de l'autre ont tendance à s'annihiler ce qui augmente l'efficacité et diminue la distance au bout de laquelle l'écoulement est régularisé.Neighboring vortices moving in opposite directions tend to annihilate each other which increases efficiency and decreases the distance at the end of which the flow is regularized.
Conformément à l'invention, les tourbillons des première et seconde séries sont sensiblement répartis dans une couronne périphérique de l'anneau.According to the invention, the vortices of the first and second series are substantially distributed in a peripheral ring of the ring.
La vitesse rotationnelle du fluide tourbillonnaire croit du centre vers le bord intérieur de la conduite. En créant les tourbillons secondaires dans une couronne périphérique, on obtient le maximum d'efficacité.The rotational speed of the vortex fluid increases from the center to the inner edge of the pipe. By creating secondary vortices in a peripheral crown, maximum efficiency is obtained.
Selon un mode de réalisation avantageux, les premiers moyens pour créer une première série de tourbillons comprennent une première série d'ailettes orientées radialement et régulièrement réparties sur la surface interne de l'anneau.According to an advantageous embodiment, the first means for creating a first series of vortices comprise a first series of fins oriented radially and regularly distributed over the internal surface of the ring.
Avantageusement, les seconds moyens pour créer une seconde série de tourbillons comprennent une seconde série d'ailettes orientées radialement, disposées selon une circonférence centrée sur le centre de l'anneau.Advantageously, the second means for creating a second series of vortices comprise a second series of radially oriented fins, arranged along a circumference centered on the center of the ring.
Avantageusement, la seconde série d'ailettes laisse libre un passage circulaire axial.Advantageously, the second series of fins leaves an axial circular passage free.
Selon un mode de réalisation préféré, les premiers moyens pour créer une première série de tourbillons comprennent une première série d'ailettes orientées radialement et régulièrement réparties sur la surface interne de l'anneau, et les seconds moyens pour créer une seconde série de tourbillons comprennent un support circulaire centré sur le centre de l'anneau le support circulaire délimitant un passage axial, une seconde série d'ailettes orientées radialement régulièrement réparties sur le support circulaire et pointant vers la surface interne de l'anneau, les ailettes de la seconde série étant angulairement décalées par rapport aux ailettes de la première série.According to a preferred embodiment, the first means for creating a first series of vortices include a first series of fins oriented radially and regularly distributed over the internal surface of the ring, and the second means for creating a second series of vortices a circular support centered on the center of the ring the circular support delimiting an axial passage, a second series of fins oriented radially regularly distributed on the circular support and pointing towards the internal surface of the ring, the fins of the second series being angularly offset with respect to the fins of the first series.
Dans ce mode de réalisation, avantageusement, la première série d'ailettes est contenue dans une couronne périphérique et les extrêmités des ailettes de la seconde série pénétrent dans cette couronne périphérique.In this embodiment, advantageously, the first series of fins is contained in a peripheral ring and the ends of the fins of the second series penetrate this peripheral ring.
Selon une variante de ce mode de réalisation, le redresseur comprend des ailettes internes fixées sur le support circulaire et s'étendant dans le passage axial.According to a variant of this embodiment, the rectifier comprises internal fins fixed on the circular support and extending in the axial passage.
De manière préférée, ces ailettes internes sont des extensions des ailettes de la seconde série.Preferably, these internal fins are extensions of the fins of the second series.
L'invention sera mieux comprise à la lecture de la description qui suit donnée à titre illustratif et non limitatif, et se rapportant aux dessins annexés sur lesquels :
- la figure 1 représente schématiquement un mode de réalisation de l'invention vue de face, et
- la figure 2 représente schématiquement ce mode de réalisation, vue de profil.
- FIG. 1 schematically represents an embodiment of the invention seen from the front, and
- FIG. 2 schematically represents this embodiment, seen in profile.
En référence aux figures 1 et 2, on décrit maintenant un mode de réalisation de l'invention. Le redresseur 1 comprend un anneau 10 apte à être monté sur la conduite dans laquelle circule l'écoulement à régulariser.Referring to Figures 1 and 2, an embodiment of the invention will now be described. The rectifier 1 comprises a
Une première série d'ailettes 12 est régulièrement disposée, radialement, sur la face interne de l'anneau 10. Avec D correspondant au diamètre de la conduite (non représentée) et dans cette réalisation au diamètre intérieur de l'anneau 10, les ailettes possèdent par exemple une longueur de 0.15 D et une extension longitudinale de 0.2 D.A first series of fins 12 is regularly arranged, radially, on the internal face of the
Une seconde série d'ailettes 14a est disposée régulièrement et radialement sur un support circulaire 16 centré sur le centre de l'anneau 10.A second series of
Les ailettes 14a pointent vers la surface interne de l'anneau 10. Elles sont décalées angulairement par rapport aux ailettes 12 de la première série ; sur la figure 1, chaque ailette 14a de la seconde série est disposée à mi-distance entre deux ailettes 12 voisines.The fins 14a point towards the internal surface of the
L'extrémité de chaque ailette 14a de la seconde série pénètre dans la couronne délimitée par les extrémités des ailettes 12 de la première série.The end of each
Le support circulaire 16 délimite un passage axial 18 de diamètre égal par exemple à 0.6 D. Dans ce passage 18, des ailettes internes 14b, extensions des ailettes 14a de la seconde série, pointent vers le centre de l'anneau 10.The
Les ailettes 14a de la première série possèdent par exemple une longueur de 0.075 D et une extension longitudinale de 0.2 D. Les ailettes internes 14b, possèdent dans cette configuration une longueur et une extension longitudinale identiques aux précédentes.The
Dans le mode de réalisation représenté sur la figure 1, le support circulaire 16 est fixé à la face interne de l'anneau grâce à quatre fixations 20. Dans cet exemple, les fixations 20 régulièrement réparties sur la circonférence de l'anneau, prennent la place d'une ailette 14a.In the embodiment shown in FIG. 1, the
L'anneau 10, le support 16, les fixations 20, les ailettes 12, 14a, 14b sont en matière plastique moulée ou tout autre matériau apte à supporter les contraintes induites par l'écoulement.The
Si l'écoulement de fluide possède un mouvement tourbillonnaire principal, il se forme à hauteur de l'extrémité de chaque ailette 12 de la première série un tourbillon marginal de sens de rotation inverse par rapport à celui du tourbillon incident.If the fluid flow has a main vortex movement, a marginal vortex of opposite direction of rotation is formed at the end of each fin 12 of the first series relative to that of the incident vortex.
Il se forme aussi au niveau de l'extrémité de chaque ailette 14a de la seconde série, un tourbillon marginal de sens de rotation inverse par rapport au sens de rotation des tourbillons créés par la première série d'ailettes.It also forms at the end of each
Ces tourbillons sont engendrés dans une couronne périphérique délimitée sensiblement par le support circulaire 16, c'est-à-dire dans la zone où la vitesse de rotation du fluide due au tourbillon principal est la plus importante. On obtient ainsi un effet maximum de régularisation du fluide par la transformation du tourbillon principal en une multitude de tourbillons marginaux de petites dimensions ; chaque tourbillon dû à une ailette 14a de la seconde série étant apparié à un tourbillon dû à une ailette 12 de la première série, l'effet global résultant est une régularisation du fluide au bout d'une distance d'environ 1.5 D.These vortices are generated in a peripheral ring delimited substantially by the
Le nombre des ailettes est choisi suffisant pour obtenir l'effet désiré ; dans la réalisation représentée sur la figure 1, on compte douze ailettes de la première série pour huit ailettes 14a de la seconde série, quatre de ces dernières étant remplacées par des fixations 20.The number of fins is chosen to be sufficient to obtain the desired effect; in the realization represented in FIG. 1, there are twelve fins of the first series for eight
Grâce à cette double série d'ailettes, on obtient un profil transverse symétrique pour la vitesse d'écoulement du fluide mais présentant dans sa partie centrale une bosse correspondant à la traversée du passage axial 18. Cette bosse dans le profil de vitesse s'élimine d'elle-même au bout d'une distance de 2 à 3 D. Les ailettes internes 14b placées dans le passage axial 18, permettent de réduire cette distance par la création de tourbillons marginaux.Thanks to this double series of fins, a symmetrical transverse profile is obtained for the flow speed of the fluid but having in its central part a bump corresponding to the crossing of the
Dans la réalisation représentée sur la figure 1, on obtient une distribution transverse de vitesse sensiblement plane au bout d'une distance d'environ 1.5 D après le passage par le redresseur.In the embodiment shown in Figure 1, there is obtained a substantially planar speed distribution after a distance of about 1.5 D after passing through the rectifier.
Le dispositif de l'invention, d'extension longitudinale extrêmement faible, environ 0.2 D, et présentant un coefficient de perte de charge bas, de l'ordre de 0.1, permet de régulariser un écoulement de fluide au bout d'une courte distance parcourue après le redresseur, environ 1.5 D.The device of the invention, of extremely small longitudinal extension, approximately 0.2 D, and having a low pressure drop coefficient, of the order of 0.1, makes it possible to regulate a flow of fluid after a short distance traveled after the rectifier, about 1.5 D.
Claims (9)
- A flow rectifier (1) for mounting in a circular section duct conveying a fluid, comprising:- first means (12) for creating a first series of vortices with a transversal flow rotation velocity, substantially all of said first series of vortices having a first direction of rotation,- second means (14a) for creating a second series of vortices with a transversal flow rotation velocity, substantially all of said second series of vortices having a second direction of rotation opposite to said first direction of rotation ,characterized in that said first and second means are comprised in a ring (10) which has an inside face corresponding to the diameter of the duct and have the same extension in a direction which corresponds to the longitudinal direction of extension of said ring, the vortices of said first and second series being paired so as to cancel each other.
- A rectifier according to claim 1, characterized in that the vortices of the first and second series are distributed substantially in a peripheral region of the ring.
- A rectifier according to any of the claims 1 and 2, characterized in that the first means for creating a first series of vortices comprise a first series of fins (12) extending radially, and regularly distributed around the inside surface of the ring (10).
- A rectifier according to any of the claims 1 to 3, characterized in that the second means for creating a second series of vortices comprise a second series of radially-extending fins (14a) disposed around a circumference centered on the center of the ring (10) and pointing towards the inside surface of said ring.
- A rectifier according to claim 4, characterized in that the second series of fins (14a) leaves free an axial circular passage (18).
- A rectifier according to claim 1, characterized in that :- the first means for creating a first series of vortices comprise a first series of fins (12) extending radially and uniformly distributed around the inside surface of the ring (10),- the second means for creating a second series of vortices comprise : a circular support (16) centered on the center of the ring (10), the circular support (16) delimiting an axial passage (18),a second series of fins (14a) extending radially, uniformly distributed around the circular support (16) and pointing towards the inside surface of the ring (10), the fins (14a) of the second series being angularly offset relative to the fins (12) of the first series.
- A rectifier according to claim 6, characterized in that the first series of fins (12) is contained in a peripheral region, and in that the ends of the fins (14a) of the second series penetrate into said peripheral region.
- A rectifier according to claim 6, including internal fins (14b) fixed on the circular support (16) and extending into the axial passage (18).
- A rectifier according to claim 8, characterized in that the internal fins (14b) are extensions of the fins (14a) of the second series.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9113298A FR2683003B1 (en) | 1991-10-25 | 1991-10-25 | FLOW RECTIFIER. |
| FR9113298 | 1991-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0538929A1 EP0538929A1 (en) | 1993-04-28 |
| EP0538929B1 true EP0538929B1 (en) | 1996-09-11 |
Family
ID=9418387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92203062A Expired - Lifetime EP0538929B1 (en) | 1991-10-25 | 1992-10-06 | Flow rectifier |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5309946A (en) |
| EP (1) | EP0538929B1 (en) |
| JP (1) | JPH05202912A (en) |
| AT (1) | ATE142748T1 (en) |
| CA (1) | CA2079621A1 (en) |
| DE (1) | DE69213648T2 (en) |
| DK (1) | DK0538929T3 (en) |
| ES (1) | ES2094279T3 (en) |
| FR (1) | FR2683003B1 (en) |
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| GB9319025D0 (en) * | 1993-09-14 | 1993-10-27 | Ans Karsto Metering & Technolo | Flow cobditioner |
| WO1998016695A1 (en) * | 1996-10-11 | 1998-04-23 | Dieter Wildfang Gmbh | Jet adjuster |
| US6042263A (en) * | 1998-04-29 | 2000-03-28 | Mentzer; Marvin R. | Mixed phase ruff body flow diffuser |
| WO2004088062A1 (en) * | 2003-04-04 | 2004-10-14 | Siphonic Systems Limited | Flow generator |
| US7306170B1 (en) * | 2003-06-02 | 2007-12-11 | Casino Advisory Services, Llc | Lawn sprinkler flow control device and tool therefor |
| US7347223B2 (en) * | 2003-07-21 | 2008-03-25 | The Metraflex Company | Pipe flow stabilizer |
| GB2406386B (en) * | 2003-09-29 | 2007-03-07 | Schlumberger Holdings | Isokinetic sampling |
| US7270214B1 (en) | 2004-06-16 | 2007-09-18 | Westerngeco L.L.C. | Method and apparatus for reducing and extracting wing-tip vortex energy |
| GB2432425B (en) * | 2005-11-22 | 2008-01-09 | Schlumberger Holdings | Isokinetic sampling method and system for multiphase flow from subterranean wells |
| US7708453B2 (en) * | 2006-03-03 | 2010-05-04 | Cavitech Holdings, Llc | Device for creating hydrodynamic cavitation in fluids |
| US9068499B2 (en) * | 2006-09-21 | 2015-06-30 | Borg Warner Inc. | Turbine housing with integrated ribs |
| GB2447908B (en) * | 2007-03-27 | 2009-06-03 | Schlumberger Holdings | System and method for spot check analysis or spot sampling of a multiphase mixture flowing in a pipeline |
| CN102725056B (en) * | 2009-12-18 | 2014-08-20 | 雷诺卡车公司 | Mixing system for an exhaust gases after-treatment arrangement |
| EP2375224B1 (en) * | 2010-03-18 | 2016-02-10 | SICK Engineering GmbH | Ultrasound measuring device and method for monitoring the flow speed of a liquid |
| US8439071B2 (en) * | 2011-05-27 | 2013-05-14 | Johnson Screens, Inc. | Screen basket vortex breaker for vessel |
| TWM458497U (en) * | 2013-04-08 | 2013-08-01 | guo-zhen Cai | Water hammer cancellation device |
| DE202015006618U1 (en) * | 2015-09-18 | 2016-12-21 | Neoperl Gmbh | aerator |
| JP6362041B1 (en) * | 2017-01-31 | 2018-07-25 | Toto株式会社 | Water discharge device |
| US11796255B2 (en) | 2017-02-24 | 2023-10-24 | Holtec International | Air-cooled condenser with deflection limiter beams |
| EP3645953B1 (en) * | 2017-06-28 | 2024-01-10 | Holtec International | Heat exchanger for severe service conditions |
| CN107314005B (en) * | 2017-07-18 | 2023-06-23 | 中国联合工程有限公司 | Rectifying structure for dissimilar metal overlaying high-temperature high-pressure pipeline |
| DE102017126645A1 (en) * | 2017-11-13 | 2019-05-16 | Feuerverzinkung Hannover Gmbh & Co. Kg | Method and device for surface treatment |
| JP7270371B2 (en) * | 2018-12-13 | 2023-05-10 | スタンレー電気株式会社 | Fluid sterilizer |
| US11448160B2 (en) | 2019-09-23 | 2022-09-20 | General Electric Company | High temperature gradient gas mixer |
| US20220333615A1 (en) * | 2019-09-26 | 2022-10-20 | Ebara Corporation | Vertical multi-stage pump |
| CN112747015B (en) * | 2021-01-12 | 2022-06-21 | 江苏大学 | Non-uniform incoming flow restraining structure of nuclear main pump connecting pipeline |
| US11739774B1 (en) * | 2023-01-30 | 2023-08-29 | Vortex Pipe Systems LLC | Flow modifying device with performance enhancing vane structure |
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| CA520074A (en) * | 1955-12-27 | Rolls-Royce Limited | Guide vane assemblies in annular fluid ducts | |
| CH20606A (en) * | 1899-12-26 | 1901-02-28 | Albert Schmitz | Finned tube |
| US813918A (en) * | 1899-12-29 | 1906-02-27 | Albert Schmitz | Tubes, single or compound, with longitudinal ribs. |
| US814694A (en) * | 1903-12-11 | 1906-03-13 | Sheffield Car Co | Nozzle. |
| FR362995A (en) * | 1906-02-05 | 1906-07-18 | Paul Determes | Double finned tubes for heating or cooling liquids |
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| JPH0421206Y2 (en) * | 1989-09-08 | 1992-05-14 |
-
1991
- 1991-10-25 FR FR9113298A patent/FR2683003B1/en not_active Expired - Fee Related
-
1992
- 1992-10-01 CA CA002079621A patent/CA2079621A1/en not_active Abandoned
- 1992-10-06 DK DK92203062.2T patent/DK0538929T3/da active
- 1992-10-06 ES ES92203062T patent/ES2094279T3/en not_active Expired - Lifetime
- 1992-10-06 EP EP92203062A patent/EP0538929B1/en not_active Expired - Lifetime
- 1992-10-06 AT AT92203062T patent/ATE142748T1/en not_active IP Right Cessation
- 1992-10-06 DE DE69213648T patent/DE69213648T2/en not_active Expired - Fee Related
- 1992-10-15 US US07/961,607 patent/US5309946A/en not_active Expired - Fee Related
- 1992-10-26 JP JP4287798A patent/JPH05202912A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DK0538929T3 (en) | 1997-03-03 |
| ATE142748T1 (en) | 1996-09-15 |
| CA2079621A1 (en) | 1993-04-26 |
| EP0538929A1 (en) | 1993-04-28 |
| DE69213648T2 (en) | 1997-03-27 |
| DE69213648D1 (en) | 1996-10-17 |
| JPH05202912A (en) | 1993-08-10 |
| FR2683003A1 (en) | 1993-04-30 |
| ES2094279T3 (en) | 1997-01-16 |
| US5309946A (en) | 1994-05-10 |
| FR2683003B1 (en) | 1995-02-17 |
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