汽车水平外形参数对气动阻力影响的仿真分析  

Simulation and analysis on effect of horizontal shape parameters on automotive aerodynamic drag

作　　者：郑子浩 杨志刚[1] 朱晖[1] 

机构地区：[1]同济大学上海地面交通工具风洞中心,上海201804

出　　处：《计算机辅助工程》2015年第6期1-6,共6页Computer Aided Engineering

基　　金：国家重点基础研究发展计划("九七三"计划)(2011CB711203)

摘　　要：针对现有的汽车气动性能优化研究大多集中于纵向外形参数上,缺乏对水平外形参数研究的问题,选取水平外形参数中车尾收缩角和后风窗收缩角作为气动优化研究对象.利用数值仿真软件建立车体模型并进行仿真,求解获得水平外形参数的变化对气动阻力的影响规律.将水平参数的变化与对应的纵向外形参数的减阻效果进行对比分析.结果表明:水平外形参数的变化引起尾流结构显著变化,且与对应的纵向外形参数相比其减阻效果更好.因此,水平外形参数对汽车气动性能优化具有积极影响.As to the issue that the current automotive aerodynamic performance optimization researches mostly focuse on the longitudinal shape parameters and the research on horizontal shape parameters are merely concerned,the horizontal shape parameters such as the contraction angles of tail and back windshield are chosen as the aerodynamic optimization objects,a numerical simulation software is used for automotive body modeling and simulation,and the rules of the effect of horizontal shape parameters on aerodynamic drag is summed up. The difference of drag reduction effiect of horizontal and longitudinal shape parameters are compared and analyzed. The results shows that,the change of horizontal shape parameters would cause significant change on wake structure,and it can bring better drag reduction effect than the corresponding change on the longitudinal shape parameters. It is concluded that the horizontal shape parameters would strongly contribute to the automotive aerodynamic performance.

关 键 词：汽车 性能优化 气动阻力 水平外形参数 车尾收缩角 后风窗收缩角 尾流结构 

分 类 号：U461.1[机械工程—车辆工程]