凹坑型非光滑单元体排列方式对汽车气动阻力影响分析  

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

作　　者：谢金法[1] 张靖龙[1] XIE Jinfa Zhang Jinglong(College of Vehicle ＆ Transportation Engineering, Henan University of Science and Technology, Luoyang 471003, China)

机构地区：[1]河南科技大学车辆与交通工程学院,河南洛阳471003

出　　处：《郑州大学学报（工学版）》2016年第5期86-90,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家863资助项目(2012AA111603)

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.Based on the bionics non-smooth surface,pit-type non-smooth elements arranged in rectangular,diamond and arithmetic are put on the roof of a MIRA square-back model vehicle to analyze the influence of different arrangements on the aerodynamic drag of model. In the application of CFD,the software ANSYS is used for numerical simulation,and results show that the pit-type non-smooth elements arranged in rectangular can obtain the best aerodynamic drag reduction performance,and the total drag reduction rate can reach6. 52%. Further analysis reveals that the rectangular arrangement can get a better pressure drag and surface shear stress reduction performance,so it eventually reduces the aerodynamic drag.

关 键 词：凹坑型非光滑单元体 排列方式 汽车 气动阻力 影响分析 

分 类 号：U469.72[机械工程—车辆工程]