基于顶部与侧部扰流器的轿车气动减阻  

Aerodynamic drag reduction of passenger car based on top and side spoiler

作　　者：杨瀚博 胡兴军[1] 安阳[1] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130022

出　　处：《江苏大学学报（自然科学版）》2015年第5期504-508,515,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50805062);吉林省科技支撑计划项目(20095006)

摘　　要：汽车空气动力学性能是车身设计中需要着重考虑的方面,针对某国产快背式轿车的简化模型,应用计算流体力学原理与方法,研究了轿车尾部气动附件对于快背式轿车气动阻力系数的影响.采用三棱柱半结构化网格和Realizable k-ωSST模型,对不同尺寸的顶部及侧部扰流器的外流场进行数值模拟,得到不同情况下该车的气动阻力系数、表面压力分布等气动特性.对比分析了各种方案的流动特性及阻力系数.结果表明:加装不同尺寸的扰流器,通过适当的匹配与优化,可以改善轿车的气动特性,降低气动阻力.Aerodynamic characteristic is one of the aspects that should be concerned considerably for car body design. The principle and method of computational fluid dynamics were applied to numerically simulate the external flow field about the simplified geometrical model of fast back type car. The drag coefficient was reduced via install rear accessories. Based on the triangular prism unstructured grid and Realizable k- ω SST model,the flow fields of top and side spoilers with different size were simulated to get the car＇ s aerodynamic drag coefficient,the aerodynamic characteristics of the surface pressure distribution,etc. The flow characteristics and the resistance coefficient of various schemes were analyzed.The results show that the different sizes of spoilers with reasonable matching and optimization can improve the aerodynamic characteristics of car and reduce the aerodynamic drag coefficient.

关 键 词：扰流器 气动减阻 湍流特性 空气动力学 数值模拟 

分 类 号：U461.1[机械工程—车辆工程]