【作者】 江贤军；

【导师】 钟诗清；

【作者基本信息】 武汉理工大学 ， 车辆工程， 2003， 硕士

【摘要】 由于高公路的发展、汽车车速的提高对汽车的操纵稳定性、安全性、舒适性提出了越来越高的要求，特别是由于世界能源危机，石油价格上涨，使改善汽车的燃料经济性成为汽车技术的重要课题。汽车空气动力特性对汽车的动力性、经济性和操纵稳定性有直接的影响。设计空气动力特性良好的汽车，是提高汽车动力性、经济性以及高速下的稳定性的重要途径。 风洞是传统的汽车空气动力特性的研究方法，它投资大、试验周期长，存在堵塞效应、地面效应等问题，且不能详细了解车辆外部流速、压力等参数的分布情况。所以仅采用风洞试验和路面测试技术研究汽车空气动力学，已不能满足更快速开发出更经济、安全、舒适的汽车的需要 随着计算机和计算机技术的迅速发展而蓬勃兴起的数值模拟方法为汽车空气动力性的研究开辟了新的途径。近年来，汽车空力学数值模拟发展迅速，其重要性也不断增加，应用范围不断扩大。在早期车型的开发中，应用数值模拟可为车身气动外形的初选提供依据，能方便、直观地了解汽车各部分的空气动力学状况以及尾部涡区结构及分布情况，初步计算出整车的气动阻力系数，为进一步细化设计提供依据，大大缩短了整车的开发周期，并节省了财力。而且，用数值模拟技术研究汽车流场对流体运动的认识在某种意义上比试验更深刻、更细致，不仅可以了解运动的结果，而且可以了解整体的与局部的细致过程，因此越来越得到人们的重视。 本文对项目轿车车身运用CFD软件FLUENT进行了数值模拟，并对结果进行了分析和优化。在汽车空气动力学数值模拟的实用化方面做了一些有益的尝试。更多还原

【Abstract】 With the development of highway and the increasing of vehicle velocity, the require of control stability, security and inhabited comfort are higher than before. Especially with the lake of word energy source and the increasing of oil price, how to improve the economic character turns to the most important article. The vehicle’s aerodynamic character directly affects the dynamic, economic and control stability characters. So design the vehicle with better aerodynamic is the key to all of the problems above.Wind tunnel is the traditional method of aerodynamic research of vehicle, which is not suit to develop the fasten safer N more comfortable and economical vehicle, because long research period and much money is needed, and there are jam effect> road effect. Further more, the wind runnel method can not give the velocity of the flow and tress distributing of the vehicle.The numerical simulation provides a new tool to the aerodynamic research of the vehicle, with the development of computer and compute technology. Of later years, the importance and the using field of numerical simulation are rapidly increasing. During the prophase of vehicle design, numerical simulation can conveniently and visually give the aerodynamic situation of every parts, approximately give the resistance quotiety (CD), prepares for the next design of the detail, which greatly reduce the period and money of vehicle development.The result of calculation and optimization is discussed in the article, which make some useful attempts in aspect of practicality of the flow numerical simulation.更多还原