The outer flow field over high - speed train is complex turbulent now which cause some unfavorable innuences to thc train and to the surmundings . so it is attended and studied by researchers of the vehicle aerodynamics all the time 高速列车的外流场是复杂的三维紊态流，这一紊态流对列车和周围的环境造成许多不利的影响，因此高速列车外部流场的状态一直是车辆空气动力学者所关心的问题。
