某SUV后部扰流附件的气动性能研究

基于某SUV车型,通过数值计算和风洞试验研究了14种后扰流板和侧扰流板方案对整车气动性能的影响。结果表明,单独加装任意一种扰流板,其减阻效果均较小,而在后扰流板和侧扰流板的共同作用下,减阻效果最大可达3%,且所有方案在降低阻力的同时,都会使后升力增加。根据计算得到的流场信息和尾迹区结构特性分析了扰流板的减阻机理,并根据试验结果分析了不同方案对于升力的影响规律,为相似车型扰流附件的气动优化提供了参考依据。

Study on Aerodynamic Performance of Rear Spoiler on an SUV

In this paper numerical simulation and wind tunnel tests were conducted to study the influence of rear spoiler and side spoiler designed with 14 proposals on the aerodynamic performance of an SUV model.The results indicate that the small drag reduction occurs if any spoiler is installed separately. However,the drag coefficient can be reduced by up to 3% with the combination of the rear spoiler and the side spoiler.For all the proposals the rear lift is increased while the drag is reduced.The drag reduction mechanism of the spoiler was analyzed by using the flow fields and wake field patterns obtained from the simulation, and the influence of rear and side spoiler on lift force was also discussed with test results, which provides a guidance for further investigation on the related car models.