基于CFD的超车过程车辆气动特性研究  

Aerodynamic Characteristics of Overtaking Based on CFD

作　　者：唐洪涛[1] 陈广厚 苗秀奇 董林源 TANG Hongtao;CHEN Guanghou;MIAO Xiuqi;DONG Linyuan(Tianjin Key Laboratory of Integrated Design and On-line Monitoring for the Light Industry and Food Engineering Machineryand Equipment,College of Mechanical Engineering,Tianjin University of Science & Technology,Tianjin 300222,China)

机构地区：[1]天津市轻工与食品工程机械装备集成设计与在线监控重点实验室天津科技大学机械工程学院

出　　处：《天津科技大学学报》2019年第3期68-75,共8页Journal of Tianjin University of Science & Technology

基　　金：国家自然科学基金资助项目(51778416);天津科技大学大学生创新创业训练计划(201610057030,201710057114)

摘　　要：采用网格变形和局部网格重构的动网格技术对超车过程进行二维瞬态模拟,并记录不同超车位置处的模拟数据.研究结果表明:相对超车速度增加,两车侧向力均增大;超车间距增大,两车侧向力均减小;主超车长度增加,主超车侧向力增大,被超车侧向力减小;主超车宽度增加,主超车侧向力减小,被超车侧向力增大;在设计汽车时,选择合理的车身长度与宽度能够降低车辆在复杂工况下的侧向力,提高气动稳定性.超速超车使两车侧向力变化更加剧烈,车辆的操纵稳定性有被破坏的倾向,对公共交通安全有潜在危害.在实际超车时,驾驶人员降速并适当增加超车距离,可以确保安全超车,这对于交通安全系统的发展有一定指导意义.A two-dimensional transient overtaking process was simulated by using dynamic mesh technology combining the mesh deformation and local remeshing,and the simulation data of different relative positions during the simulation process were recorded.The results show that with the increase of the relative overtaking speed,the side force of the two cars increased, and the side force of the two vehicles decreased with the increase of the overtaking distance.The main overtaking length increased,the side force of the main overtaking increased,and the side force of overtaking decreased.The main overtaking width increased,the side force of the main overtaking decreased,and the side force of overtaking increased.The side force of the vehicle under complex conditions can be reduced and the aerodynamic stability can be improved by designing reasonable body length and body width.Overspeed overtaking makes the side force of the two cars change more fiercely,and the stability handling of the vehicle has the tendency to be destroyed,which is potentially harmful to the public traffic safety.In actual overtaking,the driver decreasing the speed and appropriately increasing the overtaking distance can ensure safe overtaking,which has a certain guiding significance for the development of traffic safety system.

关 键 词：超车 动网格 瞬态模拟 侧向力 

分 类 号：U1461.1[交通运输工程]