一种低风阻汽车后保险杠的数值模拟

Numerical Simulation of a Kind of Car Rear Bumper with Low Wind Resistance

为解决汽车没有底盘后部护板情况下风阻较高问题设计了一种可降低风阻的后保险杠。计算了两种离地间隙下两种保险杠的流场,并分析了低风阻后保险杠比原后保险杠风阻低的原因。两种离地间隙下低风阻后保险杠相比原后保险杠可显著降低风阻。

A kind of a car rear bumper with low wind resistance is designed to solve the problem that the drag coefficient of a car without back chassis board is high.The flow fields of the rear bumper with low wind resistance and the original rear bumper are got by numerical computations in two rear bumper ground clearances and the reason of the wind resistance of the low wind resistance bumper is lower than the original one in analyzed.The drag coefficient reduce obviously in two ground clearance.