基于CFD的客车空气动力学分析

为了解决客车在高速行驶时,气动阻力急剧增加,耗油量增加的问题,针对某国产大型客车的简化模型及改进模型,应用计算流体力学原理和方法对模型的外流场进行了数值模拟,得到了两种客车模型的表面压力分布、速度矢量分布以及气动阻力系数等气动特性.对比分析表明:增大前围与顶部的圆角可以降低客车气动阻力,但是对后部流场影响很小.

Passenger Car Aerodynamics Analysis Based on CFD

With the average speed of passenger cars increasing dramatically,especially in high speed,aerodynamic drag of the passenger cars increases rapidly,and fuel consumption increases.A numerical simulation of flow field on a simplified model and an improved model of a China-made large passenger was conducted using principles and methods of computational fluid dynamics.Such aerodynamic characteristics of two passenger car models were obtained as surface pressure distribution,velocity vector distribution and aerodynamic drag coefficient.Comparative analysis showed increasing the fillet of the front wall and the top could reduce the aerodynamic drag but had little effect on the rear of the flow field.