后扰流板攻角对汽车气动特性影响的模拟研究

Numerical Simulation of Effect of Rear Spoiler Angle of Attack on Automobile Aerodynamics Characteristics

为了优化汽车的空气动力学特性,利用计算流体力学软件FLUENT,对某款高级轿车的简化模型进行了3维数值模拟,分析了在2种车速下,未加装后扰流板和加装各种攻角的后扰流板汽车的气动特性,得出了后扰流板攻角对汽车气动特性的影响规律,同时比较了后扰流板不同攻角工况下尾部的外流场,并分析了加装后扰流板后对汽车尾部流场的改善情况。

In order to improve automobile aerodynamics characteristics, the 3D models of a simplified car were studied by the numerical simulation method of the CFD software FLUENT. The aerodynamic characteristics of the models without rear spoiler and with rear spoiler at different angles of attack were numerically simulated at two kinds of speeds. The car＇s aerodynamics characteristics influenced by rear spoiler at different angles of attack were obtained. The wake flow-fields with rear spoiler at different angles of attack were compared. The improvements of the rear flow fields of the car by the rear spoiler were analyzed.