风雨耦合环境下CR400BF型动车组刮雨器刮臂扭矩仿真分析
李赫许鹏张浩淼杨东泽
Simulation Analysis of Wiper Arm Torque for CR400BF EMU in Wind-Rain Coupled Environment
LI HeXU PengZHANG HaomiaoYANG Dongze
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作者信息:中车长春轨道客车股份有限公司, 130062, 长春
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Affiliation:CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20253014
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中图分类号/CLCN:U270.38
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栏目/Col:车辆制造与列车控制
摘要:
［目的］风雨耦合环境下，350 km/h运行时的CR400BF型动车组刮雨器在气动压力方面缺乏模拟和试验研究数据，有必要通过仿真分析来有效评估刮雨器在高速运行过程中的结构安全性。［方法］利用流体仿真软件分析刮雨器在风雨耦合环境下的流场分布规律和气动压力。基于气动压力研究结果，进一步对刮雨器进行结构分析，获得了风雨耦合环境作用于刮雨器转轴处的扭矩值。［结果及结论］在无雨和短时大雨条件下，车头流场沿车头表面向上运动，车头表面流线较密集，流速较快，刮雨器刮臂转角对车头的流场和气动压力影响较小。不同转角下刮雨器的流场分布具有相似性，雨滴的运动对刮雨器流场的影响较小。在无雨条件下：刮臂转角0°时刮臂所受的扭矩最大，刮臂2扭矩达到了28.9 N·m；刮臂转角为25°和50°时，扭矩下降到10.0 N·m左右。在短时大雨条件下，刮雨器刮臂扭矩显著上升，刮臂转角为0°时刮臂所受扭矩最大，刮臂2扭矩达到了103.1 N·m。
Abstracts:
［Objective］ For the CR400BF EMU (electrical multiple units) operating at 350 km/h under wind-rain coupled conditions, there is a lack of simulation and experimental research data on the aerodynamic pressure acting on wipers. It is necessary to conduct simulation analysis to effectively evaluate the structural safety of wipers during high-speed operation. ［Method］ A CFD (computer fluid dynamics) simulation software is employed to analyze the flow field distribution law and the aerodynamic pressure on wipers under wind-rain coupled conditions. Based on the research results of aerodynamic pressure, structural analysis is further performed on the wiper system to determine the torque value exerted at the wiper's rotating shaft in the wind-rain coupled environment. ［Result & Conclusion］ Under no-rain and short-term heavy rainfall conditions, the flow field moves upwards along the train head surface, with densely distributed streamlines and higher flow velocities. The wiper arm rotation angle has minimal impact on the flow field and aerodynamic pressure of the train head in such condition. Since flow field distributions exhibit similarity across different wiper arm rotation angles, the raindrop motion negligibly influences the flow field of wiper. Under no-rain condition, the maximum torque occurs at a wiper arm angle of 0 degree, and the torque on Wiper Arm 2 reaches 28.9 N·m; the torque decreases to approximately 10.0 N·m at wiper arm rotation angles of 25 and 50 degrees. Under short-term heavy rainfall condition, wiper arm torque increases significantly. The maximum torque occurs at rotation angle of 0 degree, with Wiper Arm 2 torque reaching 103.1 N·m.
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