大学生方程式赛车过弯非稳态气动问题的数值与试验研究

Numerical and Experimental Study on Cornering Unsteady Aerodynamic Performance of Formula SAE Racing Car

摘要:

以大学生方程式赛车为研究对象，采用非稳态来流仿真方法对其过弯时的气动性能展开了研究。采用非稳态来流方法，将仿真来流速度设置为随时间变化的场函数以精准模拟入弯情形，并与稳态来流的弯道仿真结果进行了对比；配合仿真结果，在道路试验中使用表面压力测量对扩散器和尾翼的局部流场进行了量化。结果表明：赛车前轮以及前翼在非稳态过弯时会对下游底部流场产生较大影响，底部扩散器的非稳态气动鲁棒性将是整车气动设计的重点。

Abstract:

The unsteady flow simulation method was used to study the aerodynamic performance of the Formula SAE racing car during cornering. By using the unsteady flow method， the flow speed was set as a field function varying with time to accurately simulate the cornering situation， and the simulation results were compared with the steady cornering simulation. In conjunction with simulation results， the local flow field of diffuser and rear wing was quantitatively studied in road test using surface pressure measurement. The results show that， the front wheels and wings have a great effect on the downstream bottom airflow during unsteady cornering， and the unsteady aerodynamic robustness of the diffuser is the key point of the racing car aerodynamic design.