仿生非光滑旋成体表面减阻特性数值模拟

在前期进行的仿生非光滑旋成体模型低速风洞试验的基础上,将非光滑形态在旋成体模型上的排列方式固定为矩形布置,非光滑的尺寸固定为直径或宽度为1 mm,深度或高度为0.5 mm,在风速为44 m/s时,对布置在模型尾部的凸包形、凹坑形和棱纹形三种非光滑模型与表面光滑模型进行了对比模拟试验。试验结果表明,布置在尾部的非光滑结构能够有效地降低模型的压差阻力,尤其是棱纹状非光滑形态模型,压差阻力降低了25.3%,总阻力降低了11.12%。

Numerical simulation on drag reduction characteristic around bodies of revolution with bionic non-smooth surface

Based on the former drag reduction experiments of the bionic non-smooth body of revolution models in the low-speed wind tunnel,the simulation wind tunnel tests at the wind speed of 44 m/s were performed for the body of revolution models with the tail rectangularly disposed by three different non-smooth structures,such as the convex dome form with the diameter/height of 1.0/0.5 mm,the dimple concave form with the diameter/depth of 1.0/0.5 mm,and the riblet form with the width/height of 1.0/0.5 mm,in contrast with the body of revolution model with smooth surface.Test results showed that the bionic non-smooth structures on the tail of the models can obviously reduce the drag due to the pressure drop,especially for the model riblet non-smooth form,its pressure drag was reduced by 25.3%,and its total drag was reduced by 11.12%.