EP0638732A1 - Diffuser - Google Patents

Diffuser Download PDF

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Publication number
EP0638732A1
EP0638732A1 EP94111532A EP94111532A EP0638732A1 EP 0638732 A1 EP0638732 A1 EP 0638732A1 EP 94111532 A EP94111532 A EP 94111532A EP 94111532 A EP94111532 A EP 94111532A EP 0638732 A1 EP0638732 A1 EP 0638732A1
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EP
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Prior art keywords
diffuser
installation
flow
section
installation surface
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Granted
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EP94111532A
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German (de)
French (fr)
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EP0638732B1 (en
Inventor
Hans Prof. Dr.-Ing. Ruscheweyh
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Balcke Duerr AG
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Balcke Duerr AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0265—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by using guiding means or impingement means inside the header box
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector

Definitions

  • the invention relates to a diffuser for installation in lines through which fluids flow, in particular in front of heat exchangers, mufflers, admixing devices and the like, preferably for power plants, with installation elements which produce turbulence.
  • Diffusers intended for installation in lines through which fluids flow are known, for example from US Pat. No. 4,971,768.
  • Such diffusers have the purpose of reducing the flow rate of gases or liquids while at the same time recovering pressure. They are used in front of heat exchangers, silencers, reactors, admixing systems, burners, rectifiers, humidifiers and line branches, especially in power plant construction, ventilation technology and plant construction.
  • the pressure recovery associated with the speed reduction depends very much on the pressure losses occurring in the diffuser, so that the structural design of the diffusers is of particular importance.
  • the built-in elements consist of a corrugated guide surface arranged in front of the diffuser inlet, by means of which swirl currents which cause swirls are to be generated.
  • guide surfaces not only cause a relatively high pressure loss, but also only have a slight swirling effect, so that in practice the effects and advantages described in the publication do not occur.
  • the invention has for its object to provide a diffuser of the type described above, which avoids separation of the flow from the diffuser wall and ensures a uniform spread of the flow on the expanding flow cross-section with little effort and low pressure losses.
  • the solution to this problem by the invention is characterized in that at least one installation surface producing a leading edge vortex system is arranged in the region of the diverging flow section of the diffuser as the installation element.
  • a plurality of installation elements can be arranged next to and / or one behind the other in the divergent flow section of the diffuser.
  • each installation surface can have a symmetrical edge profile with a plane of symmetry running in the main flow direction and can be designed with a circular, elliptical, oval, parabolic, diamond-shaped or triangular basic shape.
  • the invention proposes to profile the installation area in cross section, to form a V-shape and / or to provide it with an angled edge, as a result of which the vortex system is strengthened and the stability of the installation area is increased.
  • the invention provides the possibility of ensuring that the flow is in good contact with the diffuser wall, even in the case of diffusers with strongly diverging flow sections, and this by means of installation elements requiring only little effort.
  • the leading edge vortex systems produced by these result in only slight flow losses, so that despite the considerable improvement in the diffuser effect, an increase in efficiency is achieved at the same time.
  • the diffusers shown in FIGS. 1 to 5 each comprise an inflow channel 1, which is followed by a diverging flow section 2 which merges into an outflow channel 3. While in the embodiments according to FIGS. 1 and 2 and 4 and 5 the central axis of the outflow channel 3 is in extension of the central axis of the inflow channel 1, so that there is a symmetrical diverging flow section 2, the embodiment according to FIG. 3 shows an offset of the two central axes of the inflow channel 1 and outflow channel 3, so that an asymmetrical divergent flow section 2 results.
  • an oval or circular installation surface 4 is arranged in the diverging flow section 2, which is set at an acute angle to the main flow direction, so that there is a stationary vortex wake at each of its symmetrical leading edges.
  • the vortices shown in the illustration form a so-called leading edge vortex system which spreads transversely to the main flow direction and results in low-loss spreading of the flow, so that it bears against the wall of the diffuser even in the case of a strongly divergent flow section 2. In this way, the flow is distributed evenly and with little loss over the flow cross-section and, despite the unavoidable flow losses due to the installation of the installation surface 4, results in a pressure recovery which at least compensates for the flow losses.
  • two installation surfaces 4 are arranged in the diverging flow section 2, which are arranged symmetrically to the longitudinal central axis of the diffuser and each produce stationary leading edge vortex systems.
  • an installation surface 4 is arranged in the extension of the flow in the inflow channel 1 and a further installation surface 4 is arranged in the region of the diverging wall of the diverging flow section 2.
  • the position and size of the two installation surfaces 4 are such on the asymmetrical
  • the course of the flow section 2 of the diffuser is coordinated so that even with this special design of the diffuser, good flow of the flow against the diffuser walls widening in cross section is achieved.
  • each installation surface 4 is arranged side by side and two installation surfaces 4 one behind the other in the diverging flow section 2, the installation surfaces 4 in the flow direction being designed with a circular or elliptical basic shape and the installation surfaces 4 behind them with a triangular basic shape.
  • each installation surface produces a stationary leading edge vortex system with the properties and advantages described above.
  • the fifth embodiment according to FIG. 5 finally shows the arrangement of four installation surfaces 4 of oval or circular basic shape in the entry area of the diverging flow section 2, whereby as a special feature this entry area of the diverging flow section 2 is divided into four channel sections by partition walls 5. Mutual influences of the leading edge vortex systems generated in each case by an installation surface 4 in the inlet region of the diverging flow section 2 are excluded by the partition walls 5.
  • FIGS. 7 to 10 show four exemplary embodiments for the configuration of the installation area 4.
  • the installation area 4 shown in FIG. 4 has a triangular basic shape; 8 is diamond-shaped. 9 and 10 show an elliptical or a circular configuration of the installation surface 4.

Abstract

The invention relates to a diffuser for fitting in ducts through which fluids pass, in particular upstream of heat exchangers, silencers, admixing devices and the like, preferably for power stations, having built-in elements generating vortices. In order to avoid separation of the flow from the diffuser wall in a diffuser of this type and ensure uniform expansion of the flow over the widening flow section 2 at a low cost and with low pressure losses, a built-in area 4, producing at least one leading-edge vortex system, is arranged as built-in element in the region of the diverging flow section 2 of the diffuser. <IMAGE>

Description

Die Erfindung betrifft einen Diffusor zum Einbau in von Fluiden durchströmten Leitungen, insbesondere vor Wärmetauschern, Schalldämpfern, Zumischvorrichtungen und dergleichen, vorzugsweise für Kraftwerke, mit Verwirbelungen erzeugenden Einbauelementen.The invention relates to a diffuser for installation in lines through which fluids flow, in particular in front of heat exchangers, mufflers, admixing devices and the like, preferably for power plants, with installation elements which produce turbulence.

Zum Einbau in von Fluiden durchströmten Leitungen bestimmte Diffusoren sind bekannt, beispielsweise aus der US-PS 4 971 768. Derartige Diffusoren haben den Zweck, die Strömungsgeschwindigkeit von Gasen oder Flüssigkeiten bei gleichzeitigem Druckrückgewinn zu reduzieren. Sie werden vor Wärmetauschern, Schalldämpfern, Reaktoren, Zumischsystemen, Brennern, Gleichrichtern, Befeuchtern und Leitungsabzweigen eingesetzt, insbesondere im Kraftwerksbau, in der Lüftungstechnik und im Anlagenbau. Der mit der Geschwindigkeitsreduzierung einhergehende Druckrückgewinn hängt sehr stark von den im Diffusor auftretenden Druckverlusten ab, so daß der konstruktiven Ausgestaltung der Diffusoren eine besondere Bedeutung zukommt.Diffusers intended for installation in lines through which fluids flow are known, for example from US Pat. No. 4,971,768. Such diffusers have the purpose of reducing the flow rate of gases or liquids while at the same time recovering pressure. They are used in front of heat exchangers, silencers, reactors, admixing systems, burners, rectifiers, humidifiers and line branches, especially in power plant construction, ventilation technology and plant construction. The pressure recovery associated with the speed reduction depends very much on the pressure losses occurring in the diffuser, so that the structural design of the diffusers is of particular importance.

Bei dem aus der US-PS 4 971 768 bekannten Diffusor werden Verwirbelungen erzeugende Einbauelemente verwendet, um ein Anliegen der Strömung an der sich in Strömungsrichtung erweitenden Diffusorwand zu erzielen; dies wird mit zunehmendem Öffnungswinkel des Diffusors schwieriger.In the case of the diffuser known from US Pat. No. 4,971,768, built-in elements which generate turbulence are used in order to achieve that the flow bears against the diffuser wall which widens in the direction of flow; this becomes more difficult with increasing opening angle of the diffuser.

Bei dem aus der US-PS 4 971 768 bekannten Diffusor bestehen die Einbauelemente aus einer vor dem Diffusoreintritt angeordneten gewellten Leitfläche, durch die Verwirbelungen hervorrufende Drallströmungen erzeugt werden sollen. Derartige Leitflächen verursachen jedoch nicht nur einen relativ hohen Druckverlust, sondern haben auch nur geringe Verwirbelungseffekte, so daß in der Praxis die in der Druckschrift beschriebenen Wirkungen und Vorteile nicht eintreten.In the case of the diffuser known from US Pat. No. 4,971,768, the built-in elements consist of a corrugated guide surface arranged in front of the diffuser inlet, by means of which swirl currents which cause swirls are to be generated. However, such guide surfaces not only cause a relatively high pressure loss, but also only have a slight swirling effect, so that in practice the effects and advantages described in the publication do not occur.

Der Erfindung liegt die Aufgabe zugrunde, einen Diffusor der eingangs beschriebenen Art zu schaffen, der eine Ablösung der Strömung von der Diffusorwand vermeidet und eine gleichmäßige Ausbreitung der Strömung auf den sich erweiternden Strömungsquerschnitt mit geringem Aufwand und geringen Druckverlusten sicherstellt.The invention has for its object to provide a diffuser of the type described above, which avoids separation of the flow from the diffuser wall and ensures a uniform spread of the flow on the expanding flow cross-section with little effort and low pressure losses.

Die Lösung dieser Aufgabenstellung durch die Erfindung ist dadurch gekennzeichnet, daß als Einbauelement mindestens eine ein Vorderkantenwirbelsystem erzeugende Einbaufläche im Bereich des divergierenden Strömungsabschnittes des Diffusors angeordnet ist.The solution to this problem by the invention is characterized in that at least one installation surface producing a leading edge vortex system is arranged in the region of the diverging flow section of the diffuser as the installation element.

Durch den an der Vorderkante bzw. den Vorderkanten der an sich bekannten, gegenüber der Hauptströmungsrichtung unter einem spitzen Winkel angestellten Wirbeleinbaufläche entstehenden stationären, d.h. seine Lage nicht oder nur unwesentlich verändernden Wirbelnachlauf ergibt sich ein verlustarmes Wirbelsystem, durch das die in den Diffusor eintretende Strömung gleichmäßig auf den sich erweiternden Strömungsquerschnitt verteilt wird. Die mit dem Vorderkantenwirbelsystem erzeugte gleichmäßige Strömungsverteilung führt zu einem Druckrückgewinn, der die durch die Einbaufläche erzeugten Strömungsverluste mindestens kompensiert, so daß sich insgesamt eine erhebliche Wirkungsgradverbesserung ergibt.Due to the stationary vortex installation surface, which does not or only insignificantly change its position, which arises at the front edge or the front edges of the known vortex installation surface, which is positioned at an acute angle with respect to the main flow direction, a low-loss vortex system results, through which the flow entering the diffuser is uniform is distributed over the widening flow cross-section. The uniform flow distribution generated with the leading edge vortex system leads to a pressure recovery which at least compensates for the flow losses generated by the installation surface, so that overall there is a considerable improvement in efficiency.

In Abhängigkeit von den Abmessungen einerseits des Diffusors und andererseits der Einbauelemente können erfindungsgemäß mehrere Einbauelemente neben- und/oder hintereinander im divergierenden Strömungsabschnitt des Diffusors angeordnet sein.Depending on the dimensions of the diffuser on the one hand and the installation elements on the other hand, according to the invention a plurality of installation elements can be arranged next to and / or one behind the other in the divergent flow section of the diffuser.

Jede Einbaufläche kann gemäß einem weiteren Merkmal der Erfindung einen symmetrischen Kantenverlauf mit in Hauptströmungsrichtung verlaufender Symmetrieebene besitzen und mit einer kreisförmigen, elliptischen, ovalen, parabelförmigen, rautenförmigen oder dreieckförmigen Grundform ausgebildet sein.According to a further feature of the invention, each installation surface can have a symmetrical edge profile with a plane of symmetry running in the main flow direction and can be designed with a circular, elliptical, oval, parabolic, diamond-shaped or triangular basic shape.

Mit der Erfindung wird schließlich vorgeschlagen, die Einbaufläche im Querschnitt zu profilieren, V-förmig auszubilden und/oder mit einem abgewinkelten Rand zu versehen, wodurch das Wirbelsystem verstärkt wird und sich die Stabilität der Einbaufläche erhöht.Finally, the invention proposes to profile the installation area in cross section, to form a V-shape and / or to provide it with an angled edge, as a result of which the vortex system is strengthened and the stability of the installation area is increased.

Insgesamt ergibt sich durch die Erfindung die Möglichkeit, auch bei Diffusoren mit stark divergierenden Strömungsabschnitten ein gutes Anliegen der Strömung an der Diffusorwand sicherzustellen, und zwar durch nur geringen Aufwand erfordernde Einbauelemente. Die von diesen erzeugten Vorderkantenwirbelsysteme haben nur geringe Strömungsverluste zur Folge, so daß trotz der erheblichen Verbesserung der Diffusorwirkung gleichzeitig eine Erhöhung des Wirkungsgrades erzielt wird.Overall, the invention provides the possibility of ensuring that the flow is in good contact with the diffuser wall, even in the case of diffusers with strongly diverging flow sections, and this by means of installation elements requiring only little effort. The leading edge vortex systems produced by these result in only slight flow losses, so that despite the considerable improvement in the diffuser effect, an increase in efficiency is achieved at the same time.

Auf der Zeichnung sind fünf Ausführungsbeispiele eines erfindungsgemäßen Diffusors und vier Ausführungsbeispiele einer hierbei verwendeten Einbaufläche dargestellt, und zwar zeigen:

Fig. 1
eine schematische Seitenansicht eines ersten Ausführungsbeispiels eines Diffusors mit einer Einbaufläche,
Fig. 2
eine der Fig. 1 entsprechende Seitenansicht eines Diffusors mit zwei Einbauflächen,
Fig. 3
eine den Fig. 1 und 2 entsprechende Seitenansicht eines asymmetrischen Diffusors,
Fig. 4
eine weitere Seitenansicht eines vierten Ausführungsbeispiels eines mit vier Einbauflächen ausgestatteten Diffusors,
Fig. 5
eine fünfte Ausführungsform eines in Seitenansicht dargestellten Diffusors mit vier in getrennten Kanalabschnitten angeordneten Einbauflächen,
Fig. 6
einen Querschnitt gemäß der Schnittlinie VI-VI in Fig. 5,
Fig. 7
ein erstes Ausführungsbeispiel einer Einbaufläche mit dreieckiger Grundform,
Fig. 8
ein zweites Ausführungsbeispiel einer rautenförmigen Einbaufläche,
Fig. 9
ein drittes Ausführungsbeispiel der Einbaufläche mit elliptischer Grundform und
Fig. 10
eine kreisförmige Einbaufläche als vierte Ausführungsform.
Five exemplary embodiments of a diffuser according to the invention and four exemplary embodiments of an installation surface used here are shown in the drawing, namely:
Fig. 1
1 shows a schematic side view of a first exemplary embodiment of a diffuser with an installation area,
Fig. 2
1 corresponding side view of a diffuser with two installation surfaces,
Fig. 3
1 and 2 corresponding side view of an asymmetrical diffuser,
Fig. 4
3 shows a further side view of a fourth exemplary embodiment of a diffuser equipped with four installation surfaces,
Fig. 5
5 shows a fifth embodiment of a diffuser shown in side view with four installation surfaces arranged in separate channel sections,
Fig. 6
4 shows a cross section along the section line VI-VI in FIG. 5,
Fig. 7
a first embodiment of an installation area with a triangular basic shape,
Fig. 8
a second embodiment of a diamond-shaped installation area,
Fig. 9
a third embodiment of the installation surface with an elliptical basic shape and
Fig. 10
a circular installation area as a fourth embodiment.

Die in den Fig. 1 bis 5 dargestellten Diffusoren umfassen jeweils einen Zuströmkanal 1, an den sich ein divergierender Strömungsabschnitt 2 anschließt, der in einen Abströmkanal 3 übergeht. Während bei den Ausführungsformen nach den Fig. 1 und 2 sowie 4 und 5 die Mittelachse des Abströmkanales 3 in Verlängerung der Mittelachse des Zuströmkanales 1 liegt, so daß sich ein symmetrischer divergierender Strömungsabschnitt 2 ergibt, zeigt die Ausführungsform nach Fig. 3 einen Versatz der beiden Mittelachsen von Zuströmkanal 1 und Abströmkanal 3, so daß sich ein asymmetrischer divergierender Strömungsabschnitt 2 ergibt.The diffusers shown in FIGS. 1 to 5 each comprise an inflow channel 1, which is followed by a diverging flow section 2 which merges into an outflow channel 3. While in the embodiments according to FIGS. 1 and 2 and 4 and 5 the central axis of the outflow channel 3 is in extension of the central axis of the inflow channel 1, so that there is a symmetrical diverging flow section 2, the embodiment according to FIG. 3 shows an offset of the two central axes of the inflow channel 1 and outflow channel 3, so that an asymmetrical divergent flow section 2 results.

Bei der ersten Ausführungsform nach Fig. 1 ist im divergierenden Strömungsabschnitt 2 eine ovale bzw. kreisförmige Einbaufläche 4 angeordnet, die unter einem spitzen Winkel zur Hauptströmungsrichtung angestellt ist, so daß sich an ihren symmetrischen Vorderkanten jeweils ein stationärer Wirbelnachlauf ergibt. Die in der Darstellung eingezeichneten Wirbel bilden ein sogenanntes Vorderkantenwirbelsystem, das sich quer zur Hauptströmungsrichtung ausbreitet und eine verlustarme Ausbreitung der Strömung zur Folge hat, so daß diese auch bei stark divergierendem Strömungsabschnitt 2 an der Wand des Diffusors anliegt. Auf diese Weise verteilt sich die Strömung gleichmäßig und verlustarm auf den Strömungsquerschnitt und hat trotz der unvermeidbaren Strömungsverluste aufgrund des Einbaues der Einbaufläche 4 einen Druckrückgewinn zur Folge, der die Strömungsverluste mindestens kompensiert.In the first embodiment according to FIG. 1, an oval or circular installation surface 4 is arranged in the diverging flow section 2, which is set at an acute angle to the main flow direction, so that there is a stationary vortex wake at each of its symmetrical leading edges. The vortices shown in the illustration form a so-called leading edge vortex system which spreads transversely to the main flow direction and results in low-loss spreading of the flow, so that it bears against the wall of the diffuser even in the case of a strongly divergent flow section 2. In this way, the flow is distributed evenly and with little loss over the flow cross-section and, despite the unavoidable flow losses due to the installation of the installation surface 4, results in a pressure recovery which at least compensates for the flow losses.

Beim zweiten Ausführungsbeispiel nach Fig. 2 sind im divergierenden Strömungsabschnitt 2 zwei Einbauflächen 4 angeordnet, die symmetrisch zur Längsmittelachse des Diffusors angeordnet sind und jeweils stationäre Vorderkantenwirbelsysteme erzeugen.In the second exemplary embodiment according to FIG. 2, two installation surfaces 4 are arranged in the diverging flow section 2, which are arranged symmetrically to the longitudinal central axis of the diffuser and each produce stationary leading edge vortex systems.

Bei der dritten Ausführungsform nach Fig. 3 ist in Verlängerung der Strömung im Zuströmkanal 1 eine Einbaufläche 4 und im Bereich der divergierenden Wand des divergierenden Strömungsabschnittes 2 eine weitere Einbaufläche 4 angeordnet. Hierbei sind Lage und Größe der beiden Einbauflächen 4 derart auf den asymmetrischen Verlauf des Strömungsabschnittes 2 des Diffusors abgestimmt, daß sich auch bei dieser speziellen Ausgestaltung des Diffusors eine gute Anlage der Strömung an die sich im Querschnitt erweiternden Diffusorwandungen erreicht wird.In the third embodiment according to FIG. 3, an installation surface 4 is arranged in the extension of the flow in the inflow channel 1 and a further installation surface 4 is arranged in the region of the diverging wall of the diverging flow section 2. Here, the position and size of the two installation surfaces 4 are such on the asymmetrical The course of the flow section 2 of the diffuser is coordinated so that even with this special design of the diffuser, good flow of the flow against the diffuser walls widening in cross section is achieved.

Bei der vierten Ausgestaltung nach Fig. 4 sind jeweils zwei Einbauflächen 4 nebeneinander und zwei Einbauflächen 4 hintereinander im divergierenden Strömungsabschnitt 2 angeordnet, wobei die in Strömungsrichtung vornliegenden Einbauflächen 4 mit kreisförmiger bzw. elliptischer Grundform und die dahinterliegenden Einbauflächen 4 mit dreieckiger Grundform ausgebildet sind. Auch bei dieser Ausführungsform erzeugt jede Einbaufläche ein stationäres Vorderkantenwirbelsystem mit den voranstehend geschilderten Eigenschaften und Vorteilen.In the fourth embodiment according to FIG. 4, two installation surfaces 4 are arranged side by side and two installation surfaces 4 one behind the other in the diverging flow section 2, the installation surfaces 4 in the flow direction being designed with a circular or elliptical basic shape and the installation surfaces 4 behind them with a triangular basic shape. In this embodiment too, each installation surface produces a stationary leading edge vortex system with the properties and advantages described above.

Die fünfte Ausführungsform nach Fig. 5 zeigt schließlich die Anordnung von vier Einbauflächen 4 ovaler oder kreisförmiger Grundform im Eintrittsbereich des divergierenden Strömungsabschnittes 2, wobei als Besonderheit dieser Eintrittsbereich des divergierenden Strömungsabschnittes 2 durch Trennwände 5 in vier Kanalabschnitte aufgeteilt ist. Durch die Trennwände 5 werden gegenseitige Beeinflussungen der jeweils durch eine Einbaufläche 4 erzeugten Vorderkantenwirbelsysteme im Eintrittsbereich des divergierenden Strömungsabschnittes 2 ausgeschlossen.The fifth embodiment according to FIG. 5 finally shows the arrangement of four installation surfaces 4 of oval or circular basic shape in the entry area of the diverging flow section 2, whereby as a special feature this entry area of the diverging flow section 2 is divided into four channel sections by partition walls 5. Mutual influences of the leading edge vortex systems generated in each case by an installation surface 4 in the inlet region of the diverging flow section 2 are excluded by the partition walls 5.

Die Fig. 7 bis 10 zeigen vier Ausführungsbeispiele für die Ausgestaltung der Einbaufläche 4. Die in Fig. 4 gezeichnete Einbaufläche 4 hat eine dreieckförmige Grundform; die Einbaufläche 4 nach Fig. 8 ist rautenförmig ausgebildet. Die Fig. 9 und 10 zeigen eine elliptische bzw. eine kreisförmige Ausgestaltung der Einbaufläche 4.FIGS. 7 to 10 show four exemplary embodiments for the configuration of the installation area 4. The installation area 4 shown in FIG. 4 has a triangular basic shape; 8 is diamond-shaped. 9 and 10 show an elliptical or a circular configuration of the installation surface 4.

BezugszeichenlisteReference list

11
ZuströmkanalInflow channel
22nd
divergierender Strömungsabschnittdivergent flow section
33rd
AbströmkanalOutlet channel
44th
EinbauflächeInstallation area
55
Trennwandpartition wall

Claims (5)

Diffusor zum Einbau in von Fluiden durchströmten Leitungen, insbesondere vor Wärmetauschern, Schalldämpfern, Zumischvorrichtungen und dergleichen, vorzugsweise für Kraftwerke, mit Verwirbelungen erzeugenden Einbauelementen,
dadurch gekennzeichnet,
daß als Einbauelement mindestens eine ein Vorderkantenwirbelsystem erzeugende Einbaufläche (4) im Bereich des divergierenden Strömungsabschnittes (2) des Diffusors angeordnet ist.Diffuser for installation in lines through which fluids flow, in particular in front of heat exchangers, silencers, admixing devices and the like, preferably for power plants, with installation elements which produce turbulence,
characterized by
that at least one installation surface (4) producing a leading edge vortex system is arranged as an installation element in the region of the diverging flow section (2) of the diffuser. Diffusor nach Anspruch 1, dadurch gekennzeichnet, daß mehrere Einbauelemente (4) neben- und/oder hintereinander im divergierenden Strömungsabschnitt (2) des Diffusors angeordnet sind.Diffuser according to claim 1, characterized in that a plurality of installation elements (4) are arranged next to and / or one behind the other in the diverging flow section (2) of the diffuser. Diffusor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß jede Einbaufläche (4) einen symmetrischen Kantenverlauf mit in Hauptströmungsrichtung verlaufender Symmetrieebene besitzt.Diffuser according to claim 1 or 2, characterized in that each installation surface (4) has a symmetrical edge profile with a plane of symmetry running in the main flow direction. Diffusor nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jede Einbaufläche (4) mit einer kreisförmigen, elliptischen, ovalen, parabelförmigen, rautenförmigen oder dreieckförmigen Grundform ausgebildet ist.Diffuser according to one of claims 1 to 3, characterized in that each installation surface (4) is designed with a circular, elliptical, oval, parabolic, diamond-shaped or triangular basic shape. Diffusor nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Einbaufläche (4) im Querschnitt profiliert, V-förmig ausgebildet und/oder mit einem abgewinkelten Rand versehen ist.Diffuser according to at least one of claims 1 to 4, characterized in that the installation surface (4) is profiled in cross section, is V-shaped and / or is provided with an angled edge.
EP94111532A 1993-08-03 1994-07-23 Diffuser Expired - Lifetime EP0638732B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325977A DE4325977A1 (en) 1993-08-03 1993-08-03 Diffuser
DE4325977 1993-08-03

Publications (2)

Publication Number Publication Date
EP0638732A1 true EP0638732A1 (en) 1995-02-15
EP0638732B1 EP0638732B1 (en) 1997-02-26

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EP94111532A Expired - Lifetime EP0638732B1 (en) 1993-08-03 1994-07-23 Diffuser

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EP (1) EP0638732B1 (en)
JP (1) JPH07151108A (en)
AT (1) ATE149238T1 (en)
DE (2) DE4325977A1 (en)
ES (1) ES2100005T3 (en)
GR (1) GR3022729T3 (en)

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EP0956897A2 (en) * 1998-05-11 1999-11-17 Deutsche Babcock Anlagen Gmbh Apparatus for mixing a gas flowing through a conduit
EP1568410A1 (en) * 2004-02-27 2005-08-31 Haldor Topsoe A/S Apparatus for mixing of fluid streams
US6964698B1 (en) 2004-06-07 2005-11-15 Balcke-Durr Gmbh Gas supply for electrostatic filter and electrostatic filter arrangement
EP1757778A1 (en) 2005-08-23 2007-02-28 Balcke-Dürr GmbH Exhaust gas duct of a gas turbine and method for mixing the exhaust gas
US7448794B2 (en) 2004-02-27 2008-11-11 Haldor Topsoe A/S Method for mixing fluid streams
EP2123879A1 (en) * 2008-05-19 2009-11-25 Delphi Technologies, Inc. Deflector for mixing and homogenisize exhaust flow in front of an exhaust gas converter
EP2620208A1 (en) 2012-01-25 2013-07-31 Alstom Technology Ltd Gas mixing arrangement
US8661783B2 (en) 2011-06-27 2014-03-04 Rolls-Royce Plc Heat exchanger having swirling means
US9291177B2 (en) 2010-06-01 2016-03-22 Esg Mbh Duct having flow conducting surfaces
CN107078605A (en) * 2014-09-18 2017-08-18 西门子公司 Electrodynamics machinery with cooling flow passage

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US7510471B2 (en) 2002-12-03 2009-03-31 Lg Electronics Inc. Flow spreading mechanism
TWI426952B (en) 2006-06-27 2014-02-21 Sulzer Chemtech Ag A static mixer having a vane pair for the generation of a flow swirl in the direction of a passage flow
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DE102008050153B4 (en) 2008-10-01 2022-02-03 Rational Ag Cooking appliance with heat exchanger line
AT507552B1 (en) * 2009-05-22 2010-06-15 Siemens Vai Metals Tech Gmbh METHOD AND DEVICE FOR INFLUENCING FLOW CHARACTERISTICS IN A FLUID CURRENT
DE102011012039A1 (en) 2011-02-22 2012-08-23 Esg Mbh Duct section for use as ring diffuser for axial blower with post-guide vane, has annular components subdividing duct cross-section into sub ducts, where displacement thickness of parts of components is increased in flow direction upto ends
DE102010051759A1 (en) * 2010-11-17 2012-05-24 Evg Lufttechnik Gmbh Axial fan with downstream diffuser and a device for equalizing the flow velocity
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CN107701510B (en) * 2017-11-07 2020-05-08 潘立华 Fluid driving impeller with high pressurization, high efficiency, low noise, small volume and light weight
CN108554703A (en) * 2018-04-19 2018-09-21 江苏三棵白杨环保科技有限公司 Enhance the method for photocatalyst atomization diffusion
FR3098579B1 (en) * 2019-07-08 2022-04-29 Renaults S A S Conduit for guiding the flow of a gas stream comprising a fin for disturbing the flow
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0956897A3 (en) * 1998-05-11 2000-12-06 BBP Environment GmbH Apparatus for mixing a gas flowing through a conduit
EP0956897A2 (en) * 1998-05-11 1999-11-17 Deutsche Babcock Anlagen Gmbh Apparatus for mixing a gas flowing through a conduit
US7448794B2 (en) 2004-02-27 2008-11-11 Haldor Topsoe A/S Method for mixing fluid streams
EP1568410A1 (en) * 2004-02-27 2005-08-31 Haldor Topsoe A/S Apparatus for mixing of fluid streams
US7547134B2 (en) 2004-02-27 2009-06-16 Haldor Topsoe A/S Arrangement for mixing of fluid streams
US6964698B1 (en) 2004-06-07 2005-11-15 Balcke-Durr Gmbh Gas supply for electrostatic filter and electrostatic filter arrangement
EP1757778A1 (en) 2005-08-23 2007-02-28 Balcke-Dürr GmbH Exhaust gas duct of a gas turbine and method for mixing the exhaust gas
US7784262B2 (en) 2005-08-23 2010-08-31 Balcke Durr Gmbh Exhaust gas guide of a gas turbine and method for mixing the exhaust gas of the gas turbine
EP2123879A1 (en) * 2008-05-19 2009-11-25 Delphi Technologies, Inc. Deflector for mixing and homogenisize exhaust flow in front of an exhaust gas converter
US9291177B2 (en) 2010-06-01 2016-03-22 Esg Mbh Duct having flow conducting surfaces
US8661783B2 (en) 2011-06-27 2014-03-04 Rolls-Royce Plc Heat exchanger having swirling means
EP2620208A1 (en) 2012-01-25 2013-07-31 Alstom Technology Ltd Gas mixing arrangement
CN107078605A (en) * 2014-09-18 2017-08-18 西门子公司 Electrodynamics machinery with cooling flow passage
US20170264169A1 (en) * 2014-09-18 2017-09-14 Siemens Aktiengesellschaft Electrodynamic machine comprising a cooling duct

Also Published As

Publication number Publication date
DE4325977A1 (en) 1995-02-09
EP0638732B1 (en) 1997-02-26
GR3022729T3 (en) 1997-06-30
ATE149238T1 (en) 1997-03-15
DE59401852D1 (en) 1997-04-03
ES2100005T3 (en) 1997-06-01
JPH07151108A (en) 1995-06-13

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