仿生鱼鳞结构对风管气流影响数值研究

Numerical Study on the Effect of Bionic Fish Scale Structure on Duct Airflow

基于RSM模型,通过数值模拟的方法研究鱼鳞结构在风管中的减阻特性。对比上凸型鱼鳞排布、上凸型单个鱼鳞排布及下凹型单个鱼鳞排布在风管中的减阻率。结果表明,上凸型鱼鳞排布与上凸型单个鱼鳞排布相比平滑风管,使风管内的阻力增大。而下凹型单个鱼鳞排布能够对风管减阻起到效果。当修改下凹形单个鱼鳞排布的深度h(h=1mm,3mm,5mm),排布间距L不变时,h=5mm时,减阻效果最佳,最大减阻率为2.5%。当修改下凹形单个鱼鳞结构的排布间距L(L=2cm,2.5cm,3cm),深度h不变时,当L=3cm时,对风管的减阻能力最佳,最大减阻率为2.8%。

Based on the RSM model,the drag reduction characteristics of fishscale structures in ducts are investigated by numerical simulation.The drag reduction rates of up-convex fishscale arrangement,up-convex single fishscale arrangement and down-convex single fishscale arrangement in ducts are compared.The results show that the up-convex fishscale arrangement smoothes the ducts compared to the up-convex single fishscale arrangement,which increases the resistance in the ducts.And the down-concave individual fishscale arrangement can be effective in reducing the resistance in the duct.When modifying the depth h(h=1mm,3mm,5mm)of the concave single fishscale row,the row spacing L is unchanged,h=5mm,the best resistance reduction effect,the maximum resistance reduction rate of 2.5%.When the spacing L(L=2cm,2.5cm,3cm)of the concave single fish scale structure is modified and the depth h is unchanged,when L=3cm,it has the best resistance reduction capability for the duct,and the maximum resistance reduction rate is 2.8%.