基于CFD仿真技术对某敞篷车外流场的优化

通过CFD方法对某敞篷车与硬顶车进行空气动力学仿真分析,对比流场发现敞篷车座舱内部形成的局部涡流区是造成周围气流回流从而降低乘坐舒适性与增加风阻系数的主要原因.通过延长挡风玻璃、提升后背高度、调整挡风玻璃倾角在33°附近,可显著减少回流到座舱的气流以提升乘坐舒适性,并降低气流在座舱及后背处发生的分离,有效降阻达16%,获得较好的空气动力学特性. 

Flow Field Optimization of a Cabriolet Based on CFD Simulation

Through simulating the aerodynamics characteristics of a cabriolet and coupe by using validate CFD method, the reason was found that the extensive separation zone in the cabin results in the back-flow air around the cabin, which not only decreased the driving comfort, but also increased the drag coefficient of cabriolet. By lengthening the upper brim of windshield at an appropriate distance, raising the height of seat back, keeping the angel of the windshield around 33° can effectively cut off the reversed flow, improve the driving comfort, reduce flow separation zone, low down the drag coefficient (16%) and ameliorate the flow field of the cabriolet.