尺寸和形状效应对多孔结构风阻系数的影响

Size and shape effects of wind drag coefficients for porous structures

为研究孔径、孔间距、孔隙形状和透风率等因素对风障这类多孔结构应用性能的影响,进行了多个参数的多孔板测力风洞试验,对比了各个参数对多孔板风阻系数的影响效应,通过数值模拟对不同参数下多孔板的流场特性及压力降变化规律进行分析,讨论了相同透风率下,孔径大小和孔间距对边界层厚度、有效透风率的影响,并与风洞试验结果进行对比。结果表明:孔隙形状对多孔板风阻系数影响较小,而长宽比、孔径和孔间距对多孔板风阻系数影响较大,可作为影响多孔结构风阻系数的关键性参数。

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.