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基于三维、定常、不可压缩N-S方程及k-ε双方程湍流模型,采用数值模拟计算方法分别对高速列车CRH_1在不同侧风风速、不同风向角工况下的气动性能进行模拟。研究结果表明:对于不同横风风速,车辆的横向力、升力及倾覆力矩均随着横风风速的增大而增大,但其对应的气动力系数基本保持不变;对于不同风向角,车辆的横向力、升力及倾覆力矩均随着风向角的增大而增大,风向角为75°时,气动力增长率变缓,对应的气动力系数变化与之一致。
Based on the three-dimensional, steady and incompressible N-S equations and the k-ε two-equation turbulence model, the aerodynamic performance of high-speed trains CRH_1 at different crosswind wind speeds and different wind direction angles were simulated by numerical simulation. The results show that the lateral force, lift force and overturning moment of vehicle increase with the increase of crosswind wind speed for different crosswind wind speeds, but their corresponding aerodynamic coefficients remain basically unchanged. For different wind direction angles, The lateral force, lift force and overturning moment all increase with the increase of wind direction angle. When the wind direction angle is 75 °, the aerodynamic growth rate becomes slower and the corresponding aerodynamic coefficient changes.