轮辐设计特征参数对整车气动特性的影响  

Influence performance with wheel spoke design parameters of vehicle aerodynamic

作　　者：苏畅[1] 韩颖[1] 张英朝[1] 苗振华 SU Chang;HAN Ying;ZHANG Ying-chao;MIAO Zhen-hua(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2021年第1期107-113,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(11772140);国家留学基金项目(201806175118).

摘　　要：为探究车轮轮辐偏移距离和轮辐曲率对整车气动阻力系数的影响,以改进的MIRA模型为研究对象,在Fluent软件中首先分别探究不同轮辐偏移距离及不同曲率与整车气动阻力系数的关系,分析不同工况减阻及增阻原因;之后将各工况进行组合,探究各组合工况对整车气动阻力系数的影响。仿真结果表明:较小的轮辐偏移距离有利于整车气动阻力系数的降低,且当轮辐偏移距离为10 mm时,整车气动阻力系数最小,仅为0.2514,与基础工况相比减阻率达5.56%;但轮辐曲率的增大会使整车气动阻力系数增大。In order to explore the influence of spoke features on vehicle aerodynamic drag coefficient(Cd),an improved MIRA model was studied in Fluent to investigate the relationship of vehicle aerodynamic drag coefficient with different spoke offset distances and curvatures.Meanwhile,the reasons of drag variance in different cases were analyzed.Then combination cases were explored on the influence of various conditions on the vehicle Cd.The simulation results indicate that smaller spoke offset distance is beneficial to the Cd reduction,and when the wheel spokes offset distance is 10 mm,the vehicle Cdis minimum,which is 0.2514.Compared with the base case,the rate of Cdreduction is 5.56%.The increase in spoke curvatures will increase the vehicle aerodynamic drag coefficient.

关 键 词：空气动力学 轮辐偏移距离 轮辐曲率 气动阻力系数 数值模拟 

分 类 号：U461.1[机械工程—车辆工程]