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Grid for improving wind parameter characteristics of turbulence flow field in wind tunnel test

A technology of wind tunnel test and parameter characteristics, applied in aerodynamic test, test of machine/structural components, measurement device, etc. Can not fully reflect the test situation and other problems

Pending Publication Date: 2021-07-30
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing passive grille device (especially the overlapping way of its grilles) will lead to changes in the simulated flow field characteristics, resulting in non-isotropic flow fields or longer distances in the downwind direction to achieve isotropy
Moreover, the horizontal and vertical grids of the traditional grid are overlapped, the horizontal grids and the vertical grids are not in the same plane, but only one side of them is in contact, and then connected by screw holes
The current traditional grid lapping method cannot form a particularly good turbulent flow field, and its isotropy index is relatively poor. For the wind tunnel test, such a wind field has a certain influence on the conclusion of the test, and it is not Can not fully reflect the test situation

Method used

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  • Grid for improving wind parameter characteristics of turbulence flow field in wind tunnel test
  • Grid for improving wind parameter characteristics of turbulence flow field in wind tunnel test
  • Grid for improving wind parameter characteristics of turbulence flow field in wind tunnel test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Set up five groups of grilles, the first group has no auxiliary plates, and the second group uses figure 2 Dimensions Accessory Plate, Group 3 Use image 3 Dimensional accessory boards (such as Figure 7 shown), Group 4 uses Figure 5 Dimensions accessory plate, used by group 5 Figure 6 Dimensional accessory boards (such as Figure 8 shown).

[0037] Index 1: The degree of turbulence changes with distance measurement as Figure 9 and Figure 10 As shown, it can be seen that the maximum increase in turbulence is about 25%. Index 2: The integration scale changes with the distance measurement as Figure 11 As shown, it can be seen that the maximum increase of the integral scale is close to about 25%. Index 3: Skewness (the closer to 0, the smaller the range of change, the better. Obviously, the range of change of the skewness of the present invention is smaller, the amplitude is closer to 0, and the duration near 0 is longer).

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Abstract

The invention discloses a grid for improving wind parameter characteristics of a turbulent flow field in a wind tunnel test, and the grid improves the wind parameter characteristics of the turbulent flow field through improving the shape of a square blank, firstly, a hexagonal accessory plate is pasted at the midpoint of the lattice edge of each grid, and the hexagonal accessory plate extends towards the square blank to form a right triangle shield, and thus all the square spaces are transformed into X-shaped spaces; and secondly, an octagonal accessory plate is adhered to each grid node, so that a right-angled triangle is formed at one corner of each square space for shielding, and all the square spaces are transformed into octagonal spaces. Experiments prove that the integral scale of a turbulent flow field can be greatly improved, the steady flow intensity of a wind field is improved, the transverse uniformity and correlation are improved, and the flow field characteristics of the grid turbulent flow field are improved.

Description

technical field [0001] The invention belongs to the field of wind tunnel test equipment, in particular to a grid for improving wind parameter characteristics of a wind tunnel test turbulent flow field. Background technique [0002] Existing passive grille devices (especially the overlapping way of the grid bars) will cause changes in the simulated flow field characteristics, resulting in non-isotropic flow fields or longer downwind distances to achieve isotropy. Moreover, the horizontal and vertical grids of the traditional grille are overlapped, the horizontal grids and the vertical grids are not in the same plane, but only one side of them is in contact, and then connected by screw holes. Now this traditional grid lapping method cannot form a particularly good turbulent flow field, and its isotropy index is relatively poor. For the wind tunnel test, such a wind field has a certain influence on the conclusion of the test, and it is not Can not fully reflect the real situat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 杨阳赵勇飞彭宇轩董彦均李佳欣李天怡李明水
Owner SOUTHWEST JIAOTONG UNIV
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