皮卡车外流场的数值模拟

采用CFD进行皮卡车的外流场模拟,得到了车身表面压力分布、尾流典型剖面流速值和尾流流场结构,数值模拟结果与风洞试验结果吻合较好。模拟结果表明,皮卡车尾涡存在于货箱上方和尾挡板后方两个区域。进行了皮卡车几种几何改型的CFD模拟,所得阻力系数变化与实车试验结果有相同的变化趋势,证实了尾挡板的减阻作用。由此得出CFD用于皮卡车外流场模拟,可获得较高的模拟精度。

Numerical simulation on flow field around pickup trucks

CFD was used to simulate flow field around a generic pickup truck. The surface pressure distributions, the wake velocity distribution of the special profiles and the flow structures were obtained. The result of numerical simulation tallies with the result of wind tunnel experimental investigation. The simulation results indicate that the wake of the pickup truck is formed of two regions, one above the truck bed, and the other behind the tailgate. CFD simulations have been done for the geometry changes of the pickup tuck. The drag coefficient variations have the same trends with the experiment results of the real pickup trucks. The effects of aerodynamic drag reduction by tailgate have been conformed. It was found that it has an accurate result with CFD to simulate the flow field around pickup trucks.