With the increase in train running speeds,the aerodynamic loading on the wipers of high-speed trains significantly esca-lates.Wiper failures under this aerodynamic loading pose serious risks on the driving safety.This paper focuses on investigating the aero-dynamic performance of wipers on trains running at high speeds.A turbulence model based on the three-dimensional,steady and incom-pressible Navier-Stokes equations and k-epsilon(k-ε)two equations was utilized,to examine the aerodynamic characteristics of the wip-ers on a three-car high-speed train running on open tracks at speed levels of 300 km/h,350 km/h and 400 km/h.The results indicate that with the increase in train speeds,aerodynamic forces on the wipers rise significantly,with lateral forces being the primary influence.The aerodynamic forces on the wipers of the head car are greater—up to 3.2 times—than those experienced by the tail car's wipers.The wip-ers on the head car exhibit an obvious negative pressure distribution at the outer side of the car body.The pressure difference on both sides of the wipers increases by 36％when the train speed reaches 350 km/h,and by 78％at 400 km/h,both compare to the conditions at 300 km/h.Moreover,air flows from the central axis of the train head to both sides of the car body,causing the wipers to move outward towards both sides.In contrast,the tail car's wipers show a trend of moving inward from both sides towards the central axis.These re-search findings offer valuable insights for the design,installation,and structural safety evaluation of wipers for high-speed trains.
关键词
高速列车/雨刮器/气动力/流场特性/数值模拟
Key words
high-speed train/wiper/aerodynamic force/flow field characteristics/numerical simulation
维普
万方数据