摘要
本文中采用CFD数值模拟的方法,研究仿生结构对某轿车空气动力学特性的影响。先对原车进行不同行驶速度下风阻系数的仿真计算,并通过风洞试验来验证数值模拟的有效性。再在原车的尾部加装扰流板和采用非光滑棱纹仿生结构,并进行不同行驶速度下的车辆气动特性仿真。结果表明,棱纹形态的仿生表面能够延迟气流分离,较好地梳理了尾部气流;在高速行驶时,采用带有扰流板和棱纹仿生结构有显著的减阻增稳效果,最大减阻率为2.59%,升力系数下降幅度在55%以上。
The effects of bionic structure on the aerodynamics characteristics of a car are studied by CFD numerical simulation in this paper.Firstly a simulation on the aerodynamic drag coefficient of original car is conducted under different driving speeds,with its effectiveness verified by wind tunnel test.Then a spoiler is added and an unsmooth biomimetic ridge structure is adopted on the rear end surface of the car with a simulation on its aerodynamic characteristics performed.The results show that the ridge-shaped bionic surface can delay the separation of airflow,better carding its wake flow.The adoption of spoiler and bionic ridge structure produces a significant effect of drag reduction and stability enhancement in high speed driving,with a drag reduction rate up to 2.59% and an over 55% drop in lift coefficient.
出处
《汽车工程》
EI
CSCD
北大核心
2015年第12期1390-1394,共5页
Automotive Engineering
基金
教育部高等学校博士学科点专项科研基金(20113227110014)
江苏省普通高校研究生科研创新计划项目(CXLX12-0657)资助
关键词
车辆
空气动力学特性
工程仿生
减阻增稳
计算流体力学
vehicle
aerodynamics characteristics
engineering bionics
drag reduction and stability enhancement
CFD
