基于CFD分析的汽车空气动力学制动研究  

Research on vehicle aerodynamic braking based on CFD analysis

作　　者：尹梦晨[1] 谷正气[1] 容江磊[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《合肥工业大学学报（自然科学版）》2011年第3期326-330,共5页Journal of Hefei University of Technology：Natural Science

基　　金：教育部长江学者与创新团队发展计划资助项目(531105050037);国家自然科学基金资助项目(50975083);国家"863"计划资助项目(2007AA04Z122);湖南大学汽车车身先进设计制造国家重点实验室自主研究资助项目(60870001)

摘　　要：考虑在制动时汽车空气动力学对汽车的影响,文章以提高制动性能为目标,应用计算流体动力学的方法对汽车尾部空气流动特征进行数值仿真,对某轿车设计出一个契合在汽车行李箱上的可翻开的翻板,旨在利用其产生的附加风阻力和负升力来减少制动时间和制动距离。通过调节翻动式后翼板的角度,用CFD软件得到数值仿真对比。结果表明,在初速度为40 m/s时开始制动,翻动60°的翻板可以减少4.8%的制动距离和3.3%的制动时间。Aiming at achieving higher vehicle braking performance, and taking the aerodynamic influence during the braking process into consideration, this paper carries out the numerical simulation of the air current of the rear of the vehicle by using the method of aerodynamics, and designs a wind-assisted emergency brake by adding a retractable spoiler shaped to the car trunk, thereby helping to shorten the brake distance and duration by the additional air drag and down-force. Several different circumstances in accordance to the spoiler angle are considered and processed hy CFD software. The results show that the brake distance is shortened by 4.8% and the brake duration by a. 3% at the initial speed of 40 m/s as the spoiler angle is 60°.

关 键 词：汽车制动 空气动力学制动板 模拟仿真 

分 类 号：U461.1[机械工程—车辆工程]