CN102706531B - Method for controlling uniformity of wind field in wind tunnel by utilizing damping nets - Google Patents
Method for controlling uniformity of wind field in wind tunnel by utilizing damping nets Download PDFInfo
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- CN102706531B CN102706531B CN201210179679.6A CN201210179679A CN102706531B CN 102706531 B CN102706531 B CN 102706531B CN 201210179679 A CN201210179679 A CN 201210179679A CN 102706531 B CN102706531 B CN 102706531B
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Abstract
The invention discloses a method for controlling uniformity of a wind field in a wind tunnel by utilizing damping nets. The method comprises the following steps of: taking one section of the wind tunnel, and dividing the section into square continuous grids with the same size, wherein the side length of each grid is smaller than the thickness of a boundary layer of the wind field; respectively measuring the wind speed at the center of each grid as the average wind speed of the grid and taking the minimal wind speed vmin; respectively designing the damping nets which have the same size with the grids and different specifications according to the situation that the damping nets in the different specifications can reduce the wind speed in various degrees, and reducing the wind speed of wind to v0 which equals vmin minus 1 after the wind passes the damping nets; and sequentially splicing the damping nets corresponding to all the grids into a whole piece of the damping nets, so that the non-uniform wind speed in front of the damping nets can be reduced to the uniform wind speed v0 behind the damping nets. According to the method for effectively controlling the uniformity of a flow field in the experimental wind tunnel by regulating the wire diameter and the aperture of the damping nets, the operation is simple and convenient, the precision is high, and reference and basis are further provided for researching wind tunnel experiments and analyzing the accuracy of experimental results in the future.
Description
Technical field
The present invention relates to wind-tunnel technique, specifically a kind of method of utilizing damping screen to control wind-tunnel Wind Field uniformity coefficient.
Background technology
Wind-tunnel is a basic equipment that carries out aerodynamics experiment, for aerodynamic development test provides required flow field, be the product of modern science technology, especially aerodynamics, fluid mechanics develop rapidly, the birth of wind-tunnel is completed a large amount of aerodynamic experiments smoothly.Modern people have obtained utilization widely with all kinds of wind-tunnel of sophisticated technologies means development at Aero-Space, rocket-powered missile, environmental pollution, auto industry, education experiment, the numerous areas such as build a bridge.
The wind-tunnel that size is different, type is different is in countries in the world Large scale construction, and associated research is the important content in aerodynamic studies field always.The main task of wind tunnel experiment is correctly simulate air flow stream fluidised form excessively in kind and accurate experimental data is provided, for further improved design project provides reliable foundation to improve the air dynamic behaviour of testee.The flow field quality that all wind tunnel tests all require wind-tunnel to provide is good, mainly refers to that the degree of uniformity of flow parameter on time and space can reach requirement of experiment.The stream condition of wind-tunnel is the important indicator of evaluation experimental wind-tunnel quality, stream condition comprises wind speed homogeneity and stability, it is to guarantee the correct condition precedent of aerodynamic experiment that wind tunnel experiment section flow field velocity has good uniformity, the quality of its performance can affect the degree of reliability of experimental result, is directly connected to the success or failure of aerodynamic studies.
Traditional wind-tunnel generally adopts the Design Modes such as diffuser, stable section, transition section, contraction section and turning, by changing the length of contraction section and shrinking the even control that recently realizes air-flow, as the bridge wind-tunnel of the ultra-low speed wind tunnels for research on Micro-UAV of the railway climatic wind tunnel in external Vienna, Academy Of Aerospace Aerodynamics, Tongji University, Shanghai University's low turbulence low-speed wind tunnel etc.Above-mentioned wind-tunnel has obtained improving significantly in the performance index such as turbulivity, Reynolds number, power factor, but can only do approximate evaluation aspect the homogeneity in flow field, according to Technology Need, do again the correction of certain experiences, and there is no a set of control method reliable, that easily go.The Flow Field Performance of aerodynamics experimental wind tunnel directly affects the distribution of pollutant concentration in wind-tunnel, the homogeneity stability that experimental wind tunnel velocity field is good, can guarantee that experiment condition is consistent in experimentation, guarantee that experimental data is representative, thereby experimental work amount is greatly reduced.If can not effectively control even flow field degree in test, will cause result to lose efficacy.Therefore, the even flow field degree of wind-tunnel is control effectively and seems very important.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of method of utilizing damping screen to control wind-tunnel Wind Field uniformity coefficient is provided, the method construction cost is low, it is efficiently convenient to operate, for the research of wind tunnel experiment from now on and the analysis of the accuracy of experimental result provide reference and foundation.
The present invention is achieved through the following technical solutions:
Utilize damping screen to control a method for wind-tunnel Wind Field uniformity coefficient, a cross section of getting wind-tunnel is divided into the square continuous grids that size is identical, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure respectively the wind speed at each grid element center place as the mean wind speed of this grid, the minimum wind speed of getting is wherein v
min; According to the damping screen of different size, wind speed is had to reducing effect in various degree, design specification is different from sizing grid is identical damping screen respectively, the wind speed after making wind by damping screen is all reduced to v
0=v
min-1; Damping screen corresponding to each grid spliced successively and become a damping screen, make before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0.
The above-mentioned method of utilizing damping screen to control wind-tunnel Wind Field uniformity coefficient, concrete steps are as follows:
(1), determine the boundary layer thickness at the even wind field place that wants, boundary layer thickness
wherein v represents the mainstream speed of wind field, and X represents the distance between test point and blower fan;
(2), the wind-tunnel cross section of damping screen installation place is divided into the square continuous grids that the length of side is a, wherein the length of a is no more than boundary layer thickness δ;
(3), measure each grid element center wind speed v everywhere
ijas the mean wind speed of this grid, getting wherein minimum wind speed is v
min, definition v
0=v
min-1;
(4) are according to formula
calculate the specification of the damping screen of each grid installation, wherein v
ijfor the mean wind speed of each grid before damping screen, v
0for the mean wind speed after damping screen, the aperture that l is damping screen, the string diameter that d is damping screen;
(5), damping screen corresponding to each grid is combined into a damping screen successively, and damping screen is arranged on to wanted even wind field place, makes before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0, reach even wind field.
It is index that wind speed homogeneity, stability are take in the present invention, by the string diameter pore size of damping adjusting net, effectively control the method for experimental wind tunnel flow field uniformity, and the method construction cost is low, it is efficiently convenient to operate, improve the accuracy of experimental result, for the research of wind tunnel experiment from now on and the analysis of the accuracy of experimental result provide reference and foundation.
Accompanying drawing explanation
Fig. 1 is the sectional view that the present invention wants even wind field place.
Embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail, but embodiments of the present invention are not limited to this, for not dated especially technological parameter, can carry out with reference to routine techniques.
Embodiment
As shown in Figure 1.The present invention utilizes damping screen to control the method for wind-tunnel Wind Field uniformity coefficient, and a cross section of getting wind-tunnel is divided into the square continuous grids that size is identical, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure respectively the wind speed at each grid element center place as the mean wind speed of this grid, the minimum wind speed of getting is wherein v
min; According to the damping screen of different size, wind speed is had to reducing effect in various degree, design specification is different from sizing grid is identical damping screen respectively, the wind speed after making wind by damping screen is all reduced to v
0=v
min-1; Damping screen corresponding to each grid spliced successively and become a damping screen, make before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0.
The above-mentioned method of utilizing damping screen to control wind-tunnel Wind Field uniformity coefficient, is characterized in that concrete steps are as follows:
(1), determine the boundary layer thickness at the even wind field place that wants, boundary layer thickness
wherein v represents the mainstream speed of wind field, and X represents the distance between test point and blower fan;
(2), the wind-tunnel cross section of damping screen installation place is divided into the square continuous grids that the length of side is a, wherein the length of a is no more than boundary layer thickness δ;
(3), measure each grid element center wind speed v everywhere
ijas the mean wind speed of this grid, getting wherein minimum wind speed is v
min, definition v
0=v
min-1;
(4) are according to formula
calculate the specification of the damping screen of each grid installation, wherein v
ijfor the mean wind speed of each grid before damping screen, v
0for the mean wind speed after damping screen, the aperture that l is damping screen, the string diameter that d is damping screen;
(5), damping screen corresponding to each grid is combined into a damping screen successively, and damping screen is arranged on to wanted even wind field place, makes before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0, reach even wind field.
Claims (1)
1. utilize damping screen to control a method for wind-tunnel Wind Field uniformity coefficient, it is characterized in that, a cross section of getting wind-tunnel is divided into the square continuous grids that size is identical, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure respectively the wind speed at each grid element center place as the mean wind speed of this grid, the minimum wind speed of getting is wherein v
min; According to the damping screen of different size, wind speed is had to reducing effect in various degree, design specification is different from sizing grid is identical damping screen respectively, the wind speed after making wind by damping screen is all reduced to v
0=v
min-1; Damping screen corresponding to each grid spliced successively and become a damping screen, make before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0;
Concrete steps are as follows:
(1), determine the boundary layer thickness at the even wind field place that wants, boundary layer thickness
wherein v represents the mainstream speed of wind field, and X represents the distance between test point and blower fan;
(2), the wind-tunnel cross section of damping screen installation place is divided into the square continuous grids that the length of side is a, wherein the length of a is no more than boundary layer thickness δ;
(3), measure the wind speed vij at each grid element center place as the mean wind speed of this grid, getting wherein minimum wind speed is vmin, definition v0=vmin-1;
(4) are according to formula
calculate the specification of the damping screen of each grid installation, wherein v
ijfor the mean wind speed of each grid before damping screen, v
0for the mean wind speed after damping screen, the aperture that l is damping screen, the string diameter that d is damping screen;
(5), damping screen corresponding to each grid is combined into a damping screen successively, and damping screen is arranged on to wanted even wind field place, makes before damping screen inhomogeneous wind speed be reduced to after damping screen wind speed v uniformly
0, reach even wind field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210179679.6A CN102706531B (en) | 2012-06-01 | 2012-06-01 | Method for controlling uniformity of wind field in wind tunnel by utilizing damping nets |
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| CN201210179679.6A CN102706531B (en) | 2012-06-01 | 2012-06-01 | Method for controlling uniformity of wind field in wind tunnel by utilizing damping nets |
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| CN102706531A CN102706531A (en) | 2012-10-03 |
| CN102706531B true CN102706531B (en) | 2014-12-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316286B (en) * | 2014-08-26 | 2018-04-27 | 中国直升机设计研究所 | A kind of rotor aerodynamic testing platform low turbulence design method |
| CN111456795B (en) * | 2020-04-14 | 2021-10-19 | 中国计量大学 | Ventilation test device for proximity continuous tunnel group and manufacturing method |
| CN114813096B (en) * | 2022-06-29 | 2022-09-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | Multi-layer sintering net test model selection method for hypersonic wind tunnel |
| CN115389780B (en) * | 2022-10-28 | 2023-02-14 | 深圳市永联科技股份有限公司 | Application method of wind tunnel testing equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435175A (en) * | 1991-11-29 | 1995-07-25 | Mercedes Benz Ag | Wind tunnel having a free jet test section for simulating wind direction fluctuations |
| US20030056580A1 (en) * | 2001-08-24 | 2003-03-27 | National Aerospace Laboratory Of Japan | Method and apparatus for reducing pressure fluctuations in supersonic wind tunnel circuit |
| CN101034033A (en) * | 2007-01-16 | 2007-09-12 | 中国计量学院 | Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter |
| CN101417220A (en) * | 2008-11-14 | 2009-04-29 | 浙江大学 | Method and device for improving flow character of gas liquid bubble column with row tubes |
| CN102435412A (en) * | 2011-12-10 | 2012-05-02 | 常州晟宇车辆部件厂 | Wind tunnel test device |
-
2012
- 2012-06-01 CN CN201210179679.6A patent/CN102706531B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435175A (en) * | 1991-11-29 | 1995-07-25 | Mercedes Benz Ag | Wind tunnel having a free jet test section for simulating wind direction fluctuations |
| US20030056580A1 (en) * | 2001-08-24 | 2003-03-27 | National Aerospace Laboratory Of Japan | Method and apparatus for reducing pressure fluctuations in supersonic wind tunnel circuit |
| CN101034033A (en) * | 2007-01-16 | 2007-09-12 | 中国计量学院 | Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter |
| CN101417220A (en) * | 2008-11-14 | 2009-04-29 | 浙江大学 | Method and device for improving flow character of gas liquid bubble column with row tubes |
| CN102435412A (en) * | 2011-12-10 | 2012-05-02 | 常州晟宇车辆部件厂 | Wind tunnel test device |
Non-Patent Citations (2)
| Title |
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| 李强 等.风洞阻尼网周边拉力分析与计算.《航空计算技术》.2009,第39卷(第6期),第30-33页. * |
| 风洞阻尼网周边拉力分析与计算;李强 等;《航空计算技术》;20091130;第39卷(第6期);第30-32、36页，尤其参见引言 * |
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