某型轿车内流场的仿真分析

利用CATIA软件建立汽车模型.针对某型轿车空气动力学流场特性,采用三维不可压缩Navier-Stokes方程和RNG(renormalization group)k-ε湍流模型来仿真计算.应用二阶迎风差分格式获得控制界面的物理量.将发动机舱冷却风进口设在车头前部,对三种不同的冷却风排风模式进行仿真分析,比较轿车气动性能以选择优越的排风模式.将驾驶室气流进口设在挡风玻璃与发动机罩交汇处,也对三种不同的驾驶室内气流排风模式进行仿真分析,以选择优化的排风模式.发动机舱内流对阻力系数影响较大,驾驶室内流对升力系数影响较大. 

Simulation analysis of a car interior flow field

Car models were built by software CATIA.In consideration of the flow field characteristics of a car aerodynamics,three-dimensional incompressible Navier-Stokes equations and RNG(renormalization group)k-ε model were used in simulation.Second-order upwind difference scheme was applied to obtain the physical quantities of control pedal.The cooling air inlet of engine compartment was placed in the front of car,simulation on three different removal modes of cooling air was implemented to select a superior ventilation mode by comparing with aerodynamic characteristics of car.The flow inlet of cab was placed between the hood and windshield.simulation on three different removal modes of flow inside the cab was implemented to select a superior ventilation mode.Interior flow of engine compartment has greater impact on drag coefficient,interior flow of cab has greater impact on lift coefficient.