基础抽吸率对汽车风洞试验的影响  

Effects of distribute suction rate on vehicle wind tunnel test

作　　者：姜叶洁 宋昕[2] 张清林[2] 

机构地区：[1]广州汽车集团股份有限公司汽车工程研究院,广东广州510640 [2]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《湖南科技大学学报（自然科学版）》2012年第2期45-49,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金(50975083)

摘　　要：采用试验手段和计算流体力学方法(Computational Fluid Dynamics,CFD),研究基础抽吸率对汽车风洞试验的影响.首先,基于HD-2汽车风洞,运用试验方法完成对汽车风洞地面边界层厚度的测量,并对边界层的厚度进行评价,结果表明边界层的厚度与来流速度成反比;其次,综合运用数值模拟和试验测量方法,研究基础抽吸率大小对汽车风洞地面边界层厚度影响,研究发现随着抽吸率的变大,边界层厚度逐渐减小.最后,以MIRA汽车标模为对象,研究基础抽吸率对汽车气动特性的影响,当基础抽吸率小于0.06时,汽车的气动阻力系数随着基础抽吸率的增大而增大,进一步增大基础抽吸率,气动阻力系数不再产生明显变化;本文研究结果对汽车风洞抽吸系统的设计和最佳抽吸率的选取有重要的指导意义.The testing methods and the Computational Fluid Dynamics method（CFD） were applied to discuss the influence of the vehicle wind tunnel test with the distribution suction rate.Firstly,using the testing methods,the thickness of the boundary layer was measured based on HD-2 wind tunnel and the evaluation was put forward,the results showed the thickness increase in contrast with the velocity.Secondly,using both CFD and testing methods,the influence was discassed of the distribution suction rate on thickness of boundary layer.The results showed the higher the distribute rate is,the thinner the boundary layer becomes and the bigger the drag coefficient becomes.There is a critical value which both the boundary layer thickness and the drag coefficient remain unchanged.The research results have directive significance in the design of vehicle wind tunnel and the best selection of distribute suction rate.

关 键 词：汽车模型风洞 基础抽吸率 计算流体力学 风洞试验 边界层 

分 类 号：U461.1[机械工程—车辆工程]