横风作用下跨线运行动车组转向架气动力变化规律研究

为跨线运行动车组自适应转向架的设计提供理论依据，开展不同横风风速下高-低速动车组转向架气动力变化规律研究。建立三维模型，生成混合网格，采用k-epsilon双方程湍流模型进行稳态计算以及Large Eddy Simulation进行非稳态计算，并通过风洞试验验证其准确性。耦合车速和风速，基于上述仿真算法得出结论：各个转向架的阻力和侧向力变化规律基本一致；动车组运行速度对转向架阻力的影响敏感度大于横风风速，中间车转向架受到的阻力较大；横风风速对转向架侧向力的影响敏感度大于动车组运行速度，尾车转向架的侧向力明显较大，横向运行稳定性最差；转向架1和转向架6的垂向力变化规律类似，转向架2至转向架5的垂向力变化规律类似。

Study on the Aerodynamic Change Law of EMU Bogies of Running-across-lines under Cross-wind Effect

Research on the aerodynamic change law of high-low speed EMU bogies under different cross wind speed are carried out. Research results provide theoretical basis for the design of EMU adaptive bogies of running across lines. A three-dimensional model is established, and a hybrid mesh is generated. The k-epsilon double-equation turbulence model is used for steady-state calculations and Large Eddy Simulation is used for unsteady-state calculations. The accuracy is verified by wind tunnel test. Coupling vehicle speed and wind speed, based on the above simulation algorithm, it is concluded that change law of drag and the lateral force of each bogie is basically consistent; the effect of EMU speed on the drag of bogies is greater than that of cross wind speed; the drag of bogies of the intermediate vehicle are relatively large; the effect of cross wind speed on the lateral force of the bogie is greater than that of EMU speed; the lateral force of the tail car bogies are significantly larger, and the lateral running stability are the worst; the vertical force law of bogies 1 and 6 are similar, and law of bogies 2 to 5 are similar.