鲨鱼皮微沟槽结构减阻计算分析

Calculation and Analysis on Drag Reduction of Shark's Skin Tiny Groove Structure

通过Matlab和Pro/E建立了鲨鱼皮微沟槽结构的三维模型.选用雷诺应力湍流模型,借助于Fluent软件,分别计算了不同横截面形状的鲨鱼皮微沟槽的摩阻系数及不同方向的切应力.计算结果表明,在选定雷诺数范围内,鲨鱼皮微沟槽结构减阻效果明显优于v形沟槽结构.鲨鱼皮微沟槽减阻效果不但与其横截面形状有关,而且与其纵截面形状有关.因此,鲨鱼皮较高减阻率是由其微沟槽结构的横向和纵向减阻效应共同作用的结果.

The 3D model of shark＇s skin tiny groove structure was constructed by Matlab and Pro/E. Using Reynolds stress turbulence model and Fluent software, the friction coefficients and shear stress in different direction of shark＇s skin tiny groove structures with different cross-sections were calculated. The results showed that, for selected range of Reynolds number, shark＇s skin tiny groove structures have better drag reduction effect than v shaped groove structure. The drag reduction capability of shark＇s skin tiny groove structure is related not only to its transverse but also to its longitudinal cross sections. Therefore, the drag reduction of shark＇s skin tiny groove structure is the result of both the transverse and the longitudinal drag reduction effects.