CRH3动车组模型侧风下明线运行的空气动力特性分析

Aerodynamic characteristics analysis of open-line operation of CRH3 EMU under crosswind

为探究在强风作用下高速列车的空气动力性能,建立3车编组CRH3动车组在侧风下明线运行的三维计算模型,在FLUENT软件中对其空气流场进行数值模拟。当列车运行速度为60 m/s时,风向角分别选取0°、±3°、±6°、±9°、±12°、±15°、±18°、±21°、±24°,计算列车表面压力分布和流场域空气流速变化情况。结果表明:车体表面正压最大值和负压最大值与风向角呈现正相关性,压力最大值位于车头正对迎风侧部位,车体表面近壁区域空气流速也与风向角具有正相关性。

To study the aerodynamic performance of high-speed trains under strong wind, the three-dimensional calculation model of CRH3 EMU with three cars running on open-line under crosswind is built, and its air flow field is simulated in FLUENT software. When the train speed is 60 m/s, the pressure distribution on train surface and the change of air velocity in flow field is computed by separately selecting the wind direction angles of 0°, ±3°, ±6°, ±9°, ±12°, ±15°, ±18°, ±21° and ±24°. The results show that there is a positive correlation between the maximum positive pressure and maximum negative pressure on the car body surface and the wind direction angle, and the maximum pressure is located at the windward side of the front of the vehicle, and the air velocity near the wall of the car body surface also has a positive correlation with the wind direction angle.