某MPV车型的尾翼气动优化研究

为优化某MPV车型的气动性能,基于风洞试验结合试验设计优化方法对其尾部的尾翼零件包括尾翼本体和侧面饰板进行多参数的优化。通过在风洞试验中的优化获得了该车型尾部的气动最优造型方案,相比原始造型方案,整车阻力降低约2.9%。之后对优化前后的造型方案进行了CFD仿真,对比了优化前后的压力分布和流场的差异,分析了整车阻力降低的原因。最后通过对比整车各区和零件上的阻力变化进一步验证了阻力降低的原因,为MPV车型的尾部气动开发提供了优化方向。

Study on Aerodynamic Optimization of Rear Spoiler in a MPV

An optimization scheme combining wind tunnel test and the design of experiment is adopted to optimize the aerodynamic performance of a MPV by multi-parameter optimization on rear spoiler itself and side trim panel.By optimization through wind tunnel test,the aerodynamically optimum styling scheme of rear end is obtained,leading to a drag reduction of around 2.9%.Then,a CFD simulation is conducted on the styling schemes both before and after optimization,their differences of tail-flow field and pressure distribution are compared and the cause of drag reduction is analyzed.Finally,the contributions of each region and part to drag change are compared,which further verifies the reason of drag reduction,providing the orientation of optimization for the aerodynamic development of the rear-end of MPV.