摘要
为了研究非光滑表面尺寸及组合布置位置对汽车气动性能的影响.以MIRA阶梯背模型为研究对象,采用CFD与风洞试验相结合的方法对3种不同位置组合模型的气动性能进行了研究,并与光滑表面模型进行对比分析,探讨其减阻机理.结果表明,行李舱盖,车身尾部和车身底部组合布置非光滑单元体减阻效果最佳,减阻率为5.90%.非光滑表面通过改善汽车的尾部涡流,降低了模型压差阻力;同时通过改变近壁面气流的流动状态,降低了车身表面的气流速度,减小车身的摩擦阻力.
In order to study the influence of size and structure of non-smooth surface on vehicle aerodynamics,we took MIRA stepped-back model as the research object,and studied the aerodynamics of three different models by using CFD method and wind tunnel experiment.Compared with smooth surface,the principle of resistance reduction was investigated.Simulation results show that the resistance reduction effect of non-smooth units originally arranged at the trunk deck,the rear of the car and underbody,is best with the ratio of 5.90％.Non-smooth surface shows good ability to reduce model pressure drag through refining eddy of the rear of body.Meanwhile,air velocity and body frictional resistance were reduced by changing the air flow of the near wall.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第11期40-45,共6页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51375155)
湖南省自然科学基金资助项目(13JJ3041)
关键词
汽车车身
气动减阻
非光滑表面
组合布置
automotive bodies
aerodynamic drag reduction
non-smooth surface
combination arrangement
