摘要
采用数值模拟和风洞试验相结合的方法,研究车身造型参数对非光滑表面气动减阻的影响。将凹坑型非光滑结构布置在国际标准汽车简化模型——Ahmed模型的不同位置,通过分析不同位置非光滑的减阻效果,确定添加非光滑表面的位置。探讨改变Ahmed模型的后风窗角度、前端倒角和离地间隙情况下非光滑车身气动特性的变化规律,找出对于非光滑车身气动外形的最佳组合方案。结果显示,离地间隙的大小对非光滑减阻效果影响最大,改变离地间隙的模型比未改变离地间隙的非光滑表面Ahmed模型的气动阻力系数减小了4.3%。
The approach of combining the numerical simulation and wind tunnel experiment was employed to study the effects of the body shape parameters on the aerodynamic drag reduction for non-smooth surface. This paper applied pit non-smooth surface to different locations of the international standard car model-Ahmed,and by analyzing the non-smooth drag reduction effects in different locations to determine where to add non-smooth surface.The variations of aerodynamic characteristics of non-smooth body were investigated and the optimum combination scheme for non-smooth aerodynamic shape was determined in case of changing the angle of the Ahmed model's rear window,front chamfer and road clearance. The results show that the size of the road clearance is the most influential one for non-smooth drag reduction,and 4. 3% drag reduction rate can be reached.
出处
《机械科学与技术》
CSCD
北大核心
2015年第8期1267-1272,共6页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51375155)
湖南省自然科学基金项目(13JJ3041)资助
关键词
Ahmed模型
凹坑型非光滑表面
车身造型参数
数值仿真
气动减阻
aerodynamic drag
aerodynamic drag reduction
ahmed model
body structure parameters
boundary conditions
boundary layers
computational fluid dynamics
computer simulation
computer software
control
drag coefficient
drag reduction
errors
experiments
flow fields
flow velocity
mesh generation
numerical simulation
pit non-smooth surface
Reynolds number
three dimensional
turbulence models
wind tunnels
