摘要
应用动网格技术和用户自定义函数(UDF)对不同边界层影响下的会车过程进行数值模拟,并通过统计不同入口气流速度比例系数时流场分布和气动力数据,分析会车时流场的变化规律.结果表明:在会车过程中,入口气流速度增大,两车气动力变化幅度增大;逆风车辆侧向力的增长幅度受车速变化的影响更明显.随着两车相对位置的变化,流场的变化使车辆受到的气动力不断变化,且会车前后的波动较大,导致车身发生波动,影响车辆行驶的稳定性和安全性.高速会车时车身抖动会更加剧烈,行驶的稳定性大幅降低,且两车间距较小易引发交通事故.在实际会车过程中,驾驶员应注意降低车速和控制两车间距,以确保安全会车.
In our study dynamic mesh technology and user-defined function(UDF)were used to simulate the crossing vehicle process affected by different boundary layers.The flow field distribution and aerodynamic data at different ratio coefficient of inlet airflow velocity were analyzed.The results showed that during the crossing process,the inlet airflow velocity increased,the magnitude of change in the aerodynamic forces of the vehicles increased.As the vehicle speed increased,the increase of lateral force of upwind vehicle was more obviously affected by the change of vehicle speed.With the change of the relative position of the vehicles,the change of flow field made the aerodynamic force of the vehicle constantly change and fluctuated greatly before and after the crossing,thus causing the body to swing and affecting the driving stability and safety of the vehicle.The body swaying will be more severe at high speed,driving stability will be greatly reduced,and the distance between vehicles will be small,which is likely to cause traffic accidents.Therefore,in the actual crossing process,the driver should pay attention to reducing the speed and controlling the distance between vehicles to ensure safe meeting.
作者
唐洪涛
陈红林
周能辉
TANG Hongtao;CHEN Honglin;ZHOU Nenghui(College of Mechanical Engineering,Tianjin University of Science&Technology,Tianjin 300222,China;Tianjin EV Powertrain Technology Co.,Ltd.,Tianjin 300385,China)
出处
《天津科技大学学报》
CAS
2023年第3期37-44,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项目(202210057084)。
关键词
边界层
动网格
会车
气动力
boundary layer
dynamic mesh
crossing vehicles
aerodynamic force
