某轻客整车风阻系数有限元分析与优化  

Finite Element Modeling and Optimization of Drag Coefficient for a Light Bus

作　　者：张汤赟[1] 邹亮[1] 袁刘凯[1] ZHANG Tang-yun;ZOU Liang;YUAN Liu-kai(Nanjing Iveco Automobile Co.,Ltd.,Nanjing 211806,China)

机构地区：[1]南京依维柯汽车有限公司,南京211806

出　　处：《汽车科技》2021年第3期93-99,共7页Auto Sci-Tech

摘　　要：本文对某轻型客车进行有限元建模,开展了整车风阻系数仿真分析,并利用整车风洞试验验证了仿真模型和仿真结果的合理性和有效性。基于对原型车的外流场分析,提出了三个降低整车风阻系数的优化措施,分别为增大前挡风玻璃迎风角度、调整尾翼翘角、增大后门倾斜角度,并研究了各措施中关键参数对风阻系数的影响。对各优化措施的仿真分析表明,前挡风玻璃迎风角度增大3°可将整车风阻系数降低4.5%;尾翼下翘有利于整车风阻系数的降低;整车风阻系数随汽车后门倾斜角度的增加而降低,可根据实车需求合理设计后门倾斜角度。The finite element model of a light bus is established and the vehicle drag coefficient is simulated and analyzed.The rationality and effectiveness of the simulation model and simulation results are verified by vehicle wind tunnel test.Based on the analysis of the external flow field of the prototype vehicle,three optimization measures are proposed to reduce the vehicle drag coefficient,which are increasing the windward angle of the front windshield,adjusting the warping angle of the rear wing,and increasing the tilt angle of the rear door.The influence of key parameters in each measure on the drag coefficient is also studied.The simulation results show that the vehicle drag coefficient can be reduced by 4.5%by increasing the windward angle of the front windshield by 3°.The downward warping of the rear wing is beneficial to the reduction of the vehicle drag coefficient.The vehicle drag coefficient decreases with the increase of rear door tilt angle.The rear door tilt angle can be reasonably designed according to the actual vehicle demand.

关 键 词：风阻系数 CFD仿真 风洞试验 流场分布 

分 类 号：U467.1[机械工程—车辆工程]