轿车尾翼气动特性的数值模拟及其影响因素分析

Rear Wing Design of High Speed Car Based on Mira Model

摘要: 利用CATIA软件建立了MIRA阶梯背模型，基于CFD技术对其外流场进行了数值模拟，并对数值模拟结果的可靠性进行了验证；在此基础上，研究了尾翼的翼型、攻角、端板形状对整车气动特性的影响。结果表明，尾翼的加装使整车的下压力增大，但阻力略有增加，其中S1223型尾翼的安装使整车的下压力增加的最多；阻力系数随着攻角度数的增大而增大，升力系数随着攻角度数的增大而减小，当尾翼的攻角为18°时，可获得较大的下压力以及较小的阻力；拼接型端板尾翼使整车的下压力增加的最多，高达14.84%,阻力系数增加了6.96%。

Abstract: In this paper, a step back model of MIRA is built with CATIA software, and the numerical simulation of the flow field is carried out based on CFD technology, and the reliability of the results is verified, the effects of the Airfoil, the angle of attack and the shape of the endplate on the aerodynamic characteristics of the vehicle are studied, the Drag Coefficient increases with the increase of the angle of attack, and the lift coefficient decreases with the increase of the angle of attack.When the angle of attack is 18°,the drag coefficient increases with the increase of the angle of attack, the lower pressure and the lower resistance can be obtained, and the lower pressure can be increased up to 14.84% and the drag coefficient can be increased by 6.96%.