基于CFD的变道超车过程气动特性分析  

Vehicle Aerodynamic Properties During Lane-Changing and Overtaking Based on CFD Simulation

作　　者：唐洪涛[1] 龙世桀 杨峻程 王旭 TANG Hongtao;LONG Shijie;YANG juncheng;WANG Xu(College of Mechanical Engineering,Tianjin University of Science&Technology,Tianjin 300222,China)

机构地区：[1]天津科技大学机械工程学院,天津300222

出　　处：《汽车工程学报》2020年第4期269-280,共12页Chinese Journal of Automotive Engineering

基　　金：国家自然科学基金(51778416);天津科技大学大学生创新创业训练计划(201910057017)。

摘　　要：基于计算流体力学(CFD)中的动网格技术对变道超车过程进行了瞬态模拟,研究表明,变道超车过程中,两车侧向力变化趋势为先增后减遂趋于平稳,两车侧向力的变化伴随着流场中涡的变化,涡产生、变大、运动、消失的过程消耗着流场中的能量。随着两车速度增大,侧向力均增大;两车间距增大,侧向力均减小。当不同车型变道超车时,两车的行驶稳定性和操作安全性较相同车型变道超车受到更为严重的影响。Based on the moving mesh technology in Computational Fluid Dynamics(CFD),the process of lane-changing and overtaking has been investigated with the transient simulation.The side forces of both two vehicles increased firstly,then decreased,and finally tend to be stable.The change in the vortex in the flow field leads to the change in the side forces of the two vehicles.The processes of vortex generation,enlargement,movement and disappearance consume the energy in the flow field.The aerodynamic properties were studied by varying the driving speeds and overtaking intervals.The results show that the side force is generally proportional to the driving speed.As the overtaking interval decreased,the side force increased and formed a suction region between the two vehicles,which caused the deterioration in driving performance and safety.The vehicle drivability decreased more significantly when overtaking another vehicle with a different model,for example,a passenger car overtaking a lorry.

关 键 词：变道超车 侧向力 瞬态模拟 涡 

分 类 号：U467.13[机械工程—车辆工程]