摘要
基于模型风洞实验台架,对汽车模型外流场尾迹区流动结构进行实验研究。采用热线风速仪,对外流场尾迹区中选定测点处的三维速度场进行采样。针对速度场的采样数据,进行功率谱密度分析,探讨了汽车尾迹区破裂涡流的频率特性及其变化规律。分析结果得出:流体微团随着流场整体运动的同时,在其运动轨迹附近进行三维脉动。
The model wind tunnel is adopted to research the structure of flow field in the wake of vehicle models. The components of velocity have been captured by using 3D CTA at chosen sampling points. According to the sampling data, the frequency characteristics and variation regularity of breakdown vortex flow have been revealed by spectrum analysis. It is indicated that fluid element fluctuates surrounding stream line when moving with the whole vortex flow fluid.
出处
《实验流体力学》
CAS
CSCD
北大核心
2013年第3期65-69,共5页
Journal of Experiments in Fluid Mechanics
基金
国家重点基础研究发展计划(973计划)资助项目(2011CB711203)
湖南大学汽车车身先进设计制造国家重点实验室开放基金31115024资助
关键词
汽车空气动力学
涡流
频谱分析
汽车模型
速度测量
automotive aerodynamics
vortex flow
spectrum analysis
vehicle model
velocity measurement
