A柱涡动力学特性随前窗倾角变化研究  

An Investigation of Changes in A-Pillar Vortex Dynamics with Windshield Inclination

作　　者：袁海东[1,2] 杨志刚[1,2,3] 李启良 YUAN Haidong;YANG Zhigang;LI Qiliang(Shanghai Automotive Wind Tunnel Center,Tongji University, Shanghai 201804,China;Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems,Tongji University,Shanghai 201804,China;Beijing Aeronautical Science and Technology Research Institute,Beijing 102211,China)

机构地区：[1]同济大学上海地面交通工具风洞中心,上海201804 [2]同济大学上海市地面交通工具空气动力与热环境模拟重点实验室,上海201804 [3]北京民用飞机技术研究中心,北京102211

出　　处：《同济大学学报（自然科学版）》2018年第12期1705-1714,1730,共11页Journal of Tongji University:Natural Science

基　　金：国家重点研发计划(2016YFB1200503-04);上海市地面交通工具空气动力与热环境模拟重点实验室(18DZ2273300)

摘　　要：采用风洞试验和数值计算的方法,通过Dihedron模型研究了前窗倾角对A柱涡动力学演化的影响.时均阻力和表面压力通过风洞试验获得,采用分离涡模拟(DES)捕捉A柱涡拓扑结构的细节特征.通过风洞试验的结果验证了DES结果的有效性.DES的结果描述了A柱涡涡破裂现象.随着前窗倾角的变化,A柱涡表现为不同的结构形态,这主要是由主涡中涡量平衡决定的.试验和数值结果均表明,随前窗倾角增大,Dihedron模型的阻力增加.讨论了纵向涡的破裂趋势和潜在的减阻方案.最后,强调了模型壁面的动力学特性及其对车内噪声的影响.The influence of windshield inclination on the dynamics evolution of the A-pillar vortex produced by Dihedron models is investigated both experimentally and numerically.The time-averaged aerodynamic drag and surface static pressure are captured by wind tunnel experiment,and detached-eddy simulation(DES)is employed to characterize the details of the topology of A-pillar vortex.The DES results are validated by experimental results both herein and from the reference paper.The breakdown phenomenon of A-pillar vortex is described by the DES results.The A-pillar vortex demonstrates different flow patterns with windshield inclination variation,which is dominated by the vorticity balance theory in the primary vortex.Both experimental and numerical results show that the aerodynamic drag of Dihedron models increases when enlarging the windshield slant angle.The breakdown trend of longitudinal vortexes is discussed and apotential drag reduction scheme is visualized.Finally,wall dynamics of Dihedron models and its influence on the in-cabin noise are emphasized.

关 键 词：A柱涡 汽车前窗倾角 涡破裂 涡量平衡 Dihedron模型 分离涡模拟 

分 类 号：U467.13[机械工程—车辆工程]