Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1677-1685.doi: 10.13229/j.cnki.jdxbgxb.20221343

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Size and shape effects of wind drag coefficients for porous structures

Feng WANG1(),Shuang-rui LIU1,Jia-ying WANG1,Jia-ling SONG2,Jun WANG1,Jiu-peng ZHANG1,Xiao-ming HUANG3   

  1. 1.School of Highway，Chang'an University，Xi'an 710064，China
    2.Research Center of Wind Engineering and Engineering Vibration，Guangzhou University，Guangzhou 510006，China
    3.School of Transportation，Southeast University，Nanjing 210018，China
  • Received:2022-10-19 Online:2023-06-01 Published:2023-07-23

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Abstract:

In order to study the effects of pore size， pore spacing， pore shape and porosity on the application performance of porous structures such as wind barriers， a multi-parameter porous plate force wind tunnel test was carried out， and the effect of various parameters on the wind resistance coefficient of porous plates was compared. The flow field characteristics and pressure drop variation of porous plate under different parameters were analyzed by numerical simulation. The effects of pore size and pore spacing on the boundary layer thickness and effective porosity under the same porosity were discussed， and the results were compared with the wind tunnel test results. The following conclusions are obtained： the pore shape has little effect on the drag coefficient of porous plate. The aspect ratio， pore diameter and pore spacing have great influence on the drag coefficient of porous plate， which can be used as the key parameters affecting the resistance coefficient of porous structure.

Key words: bridge engineering, wind tunnel test, computational fluid dynamics, numerical simulation, porous structure, drag coefficie

CLC Number: 

  • TU312

Fig.1

Three sizes of porous plate models"

Table 1

Wind tunnel test conditions"

工况尺寸/（cm×cm）长宽比孔隙形状透风率/%
A1~A740×401∶1圆形0、10、20、30、40、50、60
B1~B780×201∶4圆形0、10、20、30、40、50、60
C1~C780×401∶2圆形0、10、20、30、40、50、60
D1~D780×401∶2方形0、10、20、30、40、50、60
E180×401∶2三角形30
F180×401∶2六边形30

Fig.2

Four hole shapes of porous plate models"

Fig.3

Three-component force of porous plate section"

Fig.4

Relationship between wind drag coefficient of porous plate and porosity rate under different length-width ratios"

Fig.5

Relationship between wind drag coefficient and inclination of porous plates with different pore shapes"

Fig.6

Establishment of the model"

Fig.7

Schematic diagram of test and CFD wind drag coefficient comparison"

Table 2

Comparison of wind tunnel test and numerical simulation"

长宽比孔形CD（风洞试验）CD（CFD）
1∶2圆形1.36301.2795
1∶2方形1.36951.2730
1∶4圆形1.17641.1445
1∶1圆形1.27751.1860

Fig.8

Windward side pressure distribution diagram"

Fig.9

Leeward side pressure distribution diagram"

Fig.10

Effect of hole arrangement on wind drag coefficient"

Table 3

Effect of pore size on wind drag coefficient"

长宽比孔形排列方式孔径/mmCD（CFD）
1∶2圆形均匀81.2984
1∶2圆形均匀121.2794
1∶2圆形均匀161.2599
1∶2圆形均匀201.2331

Fig.11

Effect of hole arrangement on velocity distribution"

Fig.12

Effect of pore size on velocity distribution"

Fig.13

Relationship between wind drag coefficient and porosity and pore size"

Table 4

Effect of the Reynolds number effect on the wind drag coefficient"

长×宽/（m×m）孔径/mm孔径雷诺数CD（CFD）
0.8×0.42013 796.791.233 1
8×4200137 967.91.226 4
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