基于被动射流的汽车后视镜减阻研究  

Research on drag reduction of automobile rearview mirror based on passive jet

作　　者：张亚 王昊 张丹[1] 童一 郑焱[1] ZHANG Ya;WANG Hao;ZHANG Dan;TONG Yi;ZHENG Yan(School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,江苏常州213001

出　　处：《江苏理工学院学报》2022年第4期66-74,共9页Journal of Jiangsu University of Technology

基　　金：国家自然科学基金项目“基于多尺度涡动力学的方柱展向周期性扰动减阻机理研究”(11802108);江苏省高校自然科学基金重大项目“不同壁面条件下三维贴壁方柱流场特性及其减阻机理研究”(19KJA510002);常州市科技支撑计划—社会发展项目“基于仿生学的无人机机翼绕流场特性及其控制机理研究与应用”(CE20205036);江苏理工学院研究生科研与实践创新计划项目“低湍流度小型风洞及汽车六分力测量系统研究与设计”(XSJCX20_46)。

摘　　要：采用数值模拟和风洞试验相结合的方法,研究被动射流在汽车后视镜上的减阻效果。使用k-ε湍流模型和大涡模拟(LES)进行后视镜外流场数值模拟,得到稳态流场和瞬态流场。在此基础上,建立被动射流模型,改变射流角度,对比分析其流场特性,并通过风洞试验验证了仿真模型的有效性。研究结果表明:被动射流后视镜改变了后视镜尾涡结构,抑制了尾流中大尺度涡的形成,能够减小能量耗散,起到减阻的效果,减阻率达7.1%;射流角度的改变进一步增强了减阻效果,使减阻率提升了0.9%。A method that combines numerical simulation and wind tunnel test is used to study the drag reduction effect of the passive jet on the rearview mirror.The k-εturbulence model and large eddy simulation(LES)method are used to simulate the flow field around the rearview mirror,and the steady flow field and the transient flow field are obtained.On this basis,a passive jet model is established,the jet angle is changed,and its flow field characteristics are compared and analyzed,and the effectiveness of the simulation model is verified by wind tunnel test.The research results show that the passive jet rearview mirror changes the structure of the rearview mirror wake vortex,inhibits the formation of large-scale vortices in the wake,reduces energy dissipation,and achieves a drag reduction effect with a drag reduction rate of 7.1%.The change of jet angle further enhances the drag reduction effect,and the drag reduction rate increases by 0.9%.

关 键 词：汽车后视镜 数值模拟 风洞试验 被动射流 减阻 

分 类 号：U461.1[机械工程—车辆工程]