PIV技术在动车组受电弓区域流场测试中的应用

PIV Application Flow-field Test around Pantograph of EMU

受电弓区域是影响动车组气动阻力和振动噪声的关键部位之一,其流场特性是空气动力学研究的基础。针对该区域的流场研究多以模型试验和数值计算为主,缺乏实车试验数据为其提供数据支撑与对比基础,文中将PIV(Particle Image Velocimetry,粒子图象测速技术)引入受电弓区域流场测试,针对实车上的平面流场信息进行了采集,获得了真实有效的速度及涡量分布情况。

The pantograph area on high-speed EMU affects aerodynamic drag,vibration,and noise dramatically.Most research on the flow field characteristics around this area have been done based on model test and numerical calculation.However,the lack of real vehicle test data makes it hard to validate or compare those simulation results.In this paper,PIV(particle image velocimetry)is used to measure the flow field in pantograph area of a real vehicle for the first time.Detailed flow parameters,including velocity distribution,vorticity distribution,and velocity standard deviation etc.have been obtained to analyze the flow change around the pantograph.