CN102706531A - 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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- CN102706531A CN102706531A CN2012101796796A CN201210179679A CN102706531A CN 102706531 A CN102706531 A CN 102706531A CN 2012101796796 A CN2012101796796 A CN 2012101796796A CN 201210179679 A CN201210179679 A CN 201210179679A CN 102706531 A CN102706531 A CN 102706531A
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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 is a kind of method of utilizing damping screen to control wind-tunnel apoplexy field uniformity.
Background technology
Wind-tunnel is a basic equipment that carries out the aerodynamics experiment; For aerodynamic development test provides required flow field; Be modern science technology, the especially product of aerodynamics, fluid mechanics develop rapidly, the birth of wind-tunnel makes a large amount of aerodynamic experiments be able to smooth completion.People in modern has obtained utilization widely with all kinds of wind-tunnel of sophisticated technologies means developments at Aero-Space, rocket-powered missile, environmental pollution, auto industry, education experiment, numerous areas such as build a bridge.
The wind-tunnel that size is different, type is different is Large scale construction in countries in the world, and relevant with it research is the important content in aerodynamic studies field always.The main task of wind tunnel experiment is correctly to simulate air flow stream fluidised form in kind excessively and accurate experimental data is provided, and with the air dynamic behaviour that improves testee reliable foundation is provided for further improving design proposal.The flow field quality that all wind tunnel tests all require wind-tunnel to provide is good, refers to that mainly 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 influence the degree of reliability of experimental result, is directly connected to the success or failure of aerodynamic studies.
Traditional wind-tunnel generally adopts Design Modes such as diffuser, stable section, transition section, contraction section and turning; Length through changing contraction section with shrink the even control that recently realizes air-flow, hang down turbulivity low-speed wind tunnel etc. like the railway climatic wind tunnel in external Vienna, the minute vehicle research of Academy Of Aerospace Aerodynamics with bridge wind-tunnel, the Shanghai University of utmost point low-speed wind tunnel, Tongji University.Above-mentioned wind-tunnel has obtained improving significantly on performance index such as turbulivity, Reynolds number, power factor; But can only do approximate assessment aspect the homogeneity in flow field; Do certain experimental correction according to Technology Need again, and do not have the control method that a cover is reliable, be prone to row.The Flow Field Performance of aerodynamics experimental wind tunnel directly influences the distribution of pollutant concentration in wind-tunnel; Experimental wind tunnel velocity field good homogeneous property stability; Can guarantee that experiment condition is consistent in experimentation; Guarantee that experimental data is representative, thereby the experimental work amount is greatly reduced.If can not effectively control the even flow field degree in the test, will cause the result to lose efficacy.Therefore, the even flow field degree of wind-tunnel is control effectively seem very important.
Summary of the invention
The objective 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 apoplexy field uniformity is provided; This method construction cost is low; The operation high in efficiency and convenience is for the research of wind tunnel experiment and the analysis of the accuracy of experimental result provide reference and foundation from now on.
The present invention realizes through following technical proposals:
A kind of method of utilizing damping screen to control wind-tunnel apoplexy field uniformity, a cross section of getting wind-tunnel is divided into the identical square continuous grids of size, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure the mean wind speed of the wind speed at each grid element center place as this grid respectively, the minimum wind speed of getting wherein is v
MinDamping screen according to different size has reduction effect in various degree to wind speed, design specification is different with sizing grid is identical damping screen respectively, and the wind speed after making wind through damping screen all is reduced to v
0=v
Min-1; Splicing the corresponding damping screen of each grid successively becomes a damping screen, then makes before the damping screen uneven wind speed be reduced to behind the damping screen wind speed v uniformly
0
The above-mentioned method of utilizing damping screen to control wind-tunnel apoplexy field uniformity, concrete steps are following:
(1), confirms the boundary layer thickness at the even wind field place that wants; Boundary layer thickness
wherein v is represented the mainstream speed of wind field, and X represents the distance between test point and the blower fan;
(2), be divided into the square continuous grids that the length of side is a to the wind-tunnel cross section of damping screen installation place, 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
IjBe the mean wind speed of each grid before the damping screen, v
0Be the mean wind speed behind the damping screen, l is the aperture of damping screen, and d is the silk footpath of damping screen;
(5), be combined into a damping screen to the corresponding damping screen of each grid successively, and be installed in the even wind field place that wants to damping screen, then make before the damping screen uneven wind speed be reduced to uniform wind speed v behind the damping screen
0, reach even wind field.
The present invention is an index with wind speed homogeneity, stability; Silk footpath pore size through regulating damping screen comes the effectively method of control experimental wind tunnel flow field uniformity; And this method construction cost is low; The operation high in efficiency and convenience, the accuracy of raising experimental result is for the research of wind tunnel experiment and the analysis of the accuracy of experimental result provide reference and foundation from now on.
Description of drawings
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 done further concrete detailed description the in detail, but embodiment of the present invention is not limited thereto, the technological parameter for not indicating especially 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 apoplexy field uniformity, and a cross section of getting wind-tunnel is divided into the identical square continuous grids of size, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure the mean wind speed of the wind speed at each grid element center place as this grid respectively, the minimum wind speed of getting wherein is v
MinDamping screen according to different size has reduction effect in various degree to wind speed, design specification is different with sizing grid is identical damping screen respectively, and the wind speed after making wind through damping screen all is reduced to v
0=v
Min-1; Splicing the corresponding damping screen of each grid successively becomes a damping screen, then makes before the damping screen uneven wind speed be reduced to behind the damping screen wind speed v uniformly
0
The above-mentioned method of utilizing damping screen to control wind-tunnel apoplexy field uniformity is characterized in that concrete steps are following:
(1), confirms the boundary layer thickness at the even wind field place that wants; Boundary layer thickness
wherein v is represented the mainstream speed of wind field, and X represents the distance between test point and the blower fan;
(2), be divided into the square continuous grids that the length of side is a to the wind-tunnel cross section of damping screen installation place, 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
IjBe the mean wind speed of each grid before the damping screen, v
0Be the mean wind speed behind the damping screen, l is the aperture of damping screen, and d is the silk footpath of damping screen;
(5), be combined into a damping screen to the corresponding damping screen of each grid successively, and be installed in the even wind field place that wants to damping screen, then make before the damping screen uneven wind speed be reduced to uniform wind speed v behind the damping screen
0, reach even wind field.
Claims (2)
1. a method of utilizing damping screen to control wind-tunnel apoplexy field uniformity is characterized in that, a cross section of getting wind-tunnel is divided into the identical square continuous grids of size, and wherein, the thickness in the side ratio wind field boundary layer of grid is little; Measure the mean wind speed of the wind speed at each grid element center place as this grid respectively, the minimum wind speed of getting wherein is v
MinDamping screen according to different size has reduction effect in various degree to wind speed, design specification is different with sizing grid is identical damping screen respectively, and the wind speed after making wind through damping screen all is reduced to v
0=v
Min-1; Splicing the corresponding damping screen of each grid successively becomes a damping screen, then makes before the damping screen uneven wind speed be reduced to behind the damping screen wind speed v uniformly
0
2. the method for utilizing damping screen to control wind-tunnel apoplexy field uniformity according to claim 1 is characterized in that concrete steps are following:
(1), confirms the boundary layer thickness at the even wind field place that wants; Boundary layer thickness
wherein v is represented the mainstream speed of wind field, and X represents the distance between test point and the blower fan;
(2), be divided into the square continuous grids that the length of side is a to the wind-tunnel cross section of damping screen installation place, wherein the length of a is no more than boundary layer thickness δ;
(3), measure the mean wind speed of the wind speed vij at each grid element center place as 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
IjBe the mean wind speed of each grid before the damping screen, v
0Be the mean wind speed behind the damping screen, l is the aperture of damping screen, and d is the silk footpath of damping screen;
(5), be combined into a damping screen to the corresponding damping screen of each grid successively, and be installed in the even wind field place that wants to damping screen, then make before the damping screen uneven wind speed be reduced to uniform wind speed v behind the damping screen
0, reach even wind field.
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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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| CN102706531B CN102706531B (en) | 2014-12-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316286A (en) * | 2014-08-26 | 2015-01-28 | 中国直升机设计研究所 | Low-turbulence design method of rotor wing pneumatic testing stand |
| CN111456795A (en) * | 2020-04-14 | 2020-07-28 | 中国计量大学 | Ventilation test device for proximity continuous tunnel group and manufacturing method |
| CN114813096A (en) * | 2022-06-29 | 2022-07-29 | 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 |
| CN115389780A (en) * | 2022-10-28 | 2022-11-25 | 深圳市永联科技股份有限公司 | Wind tunnel test equipment and using method thereof |
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2012
- 2012-06-01 CN CN201210179679.6A patent/CN102706531B/en not_active Expired - Fee Related
Patent Citations (5)
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| 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316286A (en) * | 2014-08-26 | 2015-01-28 | 中国直升机设计研究所 | Low-turbulence design method of rotor wing pneumatic testing stand |
| 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 |
| CN111456795A (en) * | 2020-04-14 | 2020-07-28 | 中国计量大学 | Ventilation test device for proximity continuous tunnel group and manufacturing 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 |
| CN114813096A (en) * | 2022-06-29 | 2022-07-29 | 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 |
| CN115389780A (en) * | 2022-10-28 | 2022-11-25 | 深圳市永联科技股份有限公司 | Wind tunnel test equipment and using method thereof |
| 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 |
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