高速工况MIRA轿车尾翼气动特性仿真分析

Simulation Analysis of Aerodynamic Characteristics of MIRA Car Model at High Speed

尾翼是改善高速车辆行驶稳定性的重要装置。利用CATIA软件建立了MIRA三维模型,对其外流场进行了数值模拟,利用Profili软件对尾翼进行了设计,对加装尾翼高速轿车的外流场进行数值模拟,分析了尾翼的翼型与攻角形式对高速轿车气动升力的影响。结果表明,随着翼型的弯曲程度逐渐增大,升力系数逐渐减小,当尾翼翼型为S1223型,整车气动升力系数最大;随着攻角增大,汽车阻力系数逐渐增大,而升力系数逐渐减小。

Rear wing is an important device to improve the driving stability of high-speed vehicles.In this paper,the three-dimensional model of MIRA is established by CATIA software,and its external flow field is numerically simulated.The empennage is designed by Profili software,and the external flow field of high-speed car with empennage is numerically simulated.The influence of the wing profile and angle of attack of empennage on the aerodynamic lift of high-speed car is analyzed.The results show that the lift coefficient decreases gradually with the increasing of the bending degree of wing profile,and the aerodynamic lift coefficient of the whole car is the largest when the wing profile of empennage is S1223.With the increase of angle of attack,the drag coefficient of automobile gradually increases,while the lift coefficient gradually decreases.