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基于欧拉双流体模型,运用商用CFD软件FLUENT,对挟雨风条件下高速列车的气动特性和运行稳定性进行了三维模拟研究。分析了不同横摆角和暴雨强度下气动力和倾覆力矩的变化特征,并与无降雨条件下的相应结果进行比较。结果表明:受降雨影响,列车受到的阻力、侧向力和倾覆力矩均增大,列车气动性能损耗增加,运行稳定性降低。在模拟的降雨强度和横摆角条件下,阻力系数将提高1.8%~38.6%,侧向力系数提高0.1%~9.16%,导致列车的能耗增加;倾覆力矩系数提高1.8%~10.0%,意味着与净侧风相比,挟雨风进一步降低了列车的运行稳定性。
Based on the Euler bi-fluid model, the commercial CFD software FLUENT is used to simulate the aerodynamic characteristics and operational stability of high-speed trains subjected to rain wind. The variation characteristics of aerodynamic forces and overturning moments under different yaw angles and storm intensities are analyzed and compared with the corresponding results without rainfall. The results show that the resistance, lateral force and overturning moment are all increased by the rainfall, the loss of aerodynamic performance of the train increases, and the running stability decreases. Under simulated rainfall intensity and yaw angle, the drag coefficient will increase by 1.8% -38.6% and the lateral force coefficient by 0.1%-9.16%, resulting in an increase of train energy consumption. The overturning moment coefficient will increase by 1.8% -10.0% Means that compared with the net crosswind, rain rewind further reduces the running stability of the train.