凹坑型非光滑单元体排列方式对汽车气动阻力影响分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Influence Analysis of Pit-type Non-smooth Elements Arrangement on Aerodynamic Drag of Vehicle

Author(s):: Xie Jinfa; Zhang Jinglong; School of Vehicle and Traffic Engineering, Henan University of Science and Technology, Luoyang, Henan, 471003

Keywords:: pit-type non-smooth element; arrangement; automobile; aerodynamic drag; influence analysis

摘要:: 基于仿生学非光滑表面,分别在MIRA直背式汽车模型顶部布置矩形排列、菱形排列和等差排列的凹坑型非光滑单元体形成的非光滑表面,分析不同排列方式对汽车气动阻力的影响.通过应用CFD方法,使用有限元分析软件ANSYS进行数值仿真.仿真结果表明,以矩形排列的凹坑型非光滑表面可以获得最好的气动减阻效果,总减阻率可以达到6.52％.进一步分析发现,其原因在于矩形排列的凹坑型非光滑单元体可以更好地减小模型受到的压差阻力和表面摩擦阻力,最终减小模型受到的气动阻力.

Abstract:: Based on the non-smooth surface of bionics, the non-smooth surface formed by the pit-type non-smooth units arranged in rectangular arrangement, diamond arrangement and equidifferential arrangement was respectively arranged on the top of the MIRA straight-back car model, and the influence of different arrangements on the aerodynamic drag of the car was analyzed. .By applying the CFD method, the finite element analysis software ANSYS is used for numerical simulation. The simulation results show that the pit-shaped non-smooth surface arranged in a rectangle can obtain the best aerodynamic drag reduction effect, and the total drag reduction rate can reach 6.52%. Further The analysis found that the reason is that the concave-shaped non-smooth unit body arranged in a rectangle can better reduce the pressure difference resistance and surface friction resistance of the model, and finally reduce the aerodynamic resistance of the model.