基于CFD的汽车空气动力特性分析  

Analysis of Vehicle Aerodynamic Characteristics Based on CFD

作　　者：丁扬志 孙霁宇[2] DING Yang-zhi;SUN Ji-yu(College of Automobile Marketing,Changchun Automobile Industry Institute,Changchun Jilin 130013,China;College of Biological and Agricultural Engineering,Jilin University,Changchun Jilin 130000,China)

机构地区：[1]长春汽车工业高等专科学校汽车营销学院,吉林长春130013 [2]吉林大学生物与农业工程学院,吉林长春130000

出　　处：《计算机仿真》2021年第11期102-107,共6页Computer Simulation

基　　金：国家自然科学基金(31970454)。

摘　　要：汽车的空气动力特性对汽车的动力性、经济性、操稳性以及安全性影响重大。应用计算流体力学(CFD)对汽车的空气动力特性进行计算。建立了不同尾部、不同车身前部的汽车几何模型,并对几何模型进行了流线型处理。设置各模型的计算域初始条件以及选取湍流模型,对计算域内的网格进行剖分,并对网格进行了无关性处理,以消除网格数量对计算结果的影响。对各模型的气动特性进行计算,分别计算了相同车身前部不同车尾外形、相同车尾外形不同车身前部汽车的气动力特性,并将计算结果与经过流线型处理后的汽车进行对比,以分析汽车车前身和车尾的外形设计对其气动特性的影响。The aerodynamic characteristics of automobile have a significant impact on the power, economy, handling stability and safety of automobile. In the paper, computational fluid dynamics(CFD) was applied to calculate the aerodynamic characteristics of automobile. Firstly, the vehicle geometric models with different rear and front parts were established, and the geometric models were streamlined. The initial conditions of computational domain of the cars were set and the turbulence models were selected. Then, the mesh was generated in the computational domain and the independence was analysis to reduce the error. Finally, the aerodynamic characteristics of each model were calculated, and the aerodynamic characteristicses of vehicles with different rear shapes and the same front body, and with different front and the same rear shape were calculated respectively. The calculation results were compared with the streamlined vehicle, so as to analyze the influence of the shape design of the front and rear of the vehicle on its aerodynamic characteristics..

关 键 词：空气动力特性 计算流体力学 计算域 湍流模型 外形设计 

分 类 号：TJ7[兵器科学与技术—武器系统与运用工程]