基于模拟道路车身姿态的汽车空气动力学风洞测试

Wind Tunnel Test of Motor Vehicle Aerodynamics Based on Simulated Road Ride Height

摘要:

汽车在风洞内进行气动力测试时，由于车身姿态与实际道路状态不同，导致所测气动数据与真实数值存在差异。本文通过使用风洞天平系统的“浮动模式”来模拟车辆在道路上的实际车身姿态的方法，测试了9台不同车辆在初始固定姿态、车轮转动姿态和实际道路姿态下的车身姿态数据和气动性能数据，分析了车轮转动和气动升力/力矩对于车身姿态和气动性能的影响，给出了缩小风洞测试数据与实际道路测试数据差异的建议。

Abstract:

When conducting aerodynamic test of vehicles in a wind tunnel， the discrepancy between the vehicle's ride height in the tunnel and its actual ride height on the road results in differences between the measured aerodynamic data and the actual values. A method of simulating the actual ride height of vehicles on the road is explored in this study using the "floating mode" of the wind tunnel balance system to test the ride height and aerodynamic performance data of 9 different vehicles under initial fixed ride height， wheel rotation ride height， and actual road ride height. The impact of wheel rotation and aerodynamic lift/torque on vehicle ride height and aerodynamic performance is analyzed， and recommendations for minimizing the disparity between wind tunnel test data and actual road test data are provided.