尾部扩散器对某跑车气动性能的影响
Effect of Rear Diffuser on Aerodynamic Performances of A Racing Car

以某跑车模型为研究对象，探讨尾部小型扩散器对于车身气动性能的影响。在初始模型的基础上，进行CFD（Computational Fluid Dynamics）数值模拟计算，并对比风洞试验数据，验证仿真的可靠性。对初始模型的扩散器进行改进设计，加大扩散器的工作区域，研究其对于气动力的影响，并将改进后的扩散器与带有仿生凹坑型非光滑扰流器结合起来，通过数值模拟方法，得出压力和速度等流场参数，比较不同形式的扩散器对于气动性能的改进效果，分析气动力改善的原因。结果表明：通过对扩散器与非光滑扰流器的优化组合，能有效地提高气动负升力，减小气动阻力，达到了调谐车辆气动升力与气动阻力之间的耦合关系的目的。
Regarding a racing car as research object, the rear diffuser's effects on aerodynamic performance of the car body is discussed. The reliability of the simulation is verified by comparing wind tunnel test data with CFD numerical simulation on the basis of the initial model. The design of the initial model's diffuser is improved, the working area of the diffuser is increased, and its effect on the aerodynamic force is studied. With numerical simulation method, the improved diffuser and the bionic pit-type non-smooth spoiler with triangle wing are combined,flow field parameters such as pressure and speed are obtained,the improved results of different diffuser for aerodynamic performance are compared, and the reasons for aerodynamic improvement are analyzed. The results show that through the diffuser and non-smooth spoiler's optimal combination, the aerodynamic negative lift can be effectively improved, and the aerodynamic drag is reduced, so that the purpose of coordinating coupling relationship between aerodynamic lift and aerodynamic drag is realized