【摘要】 设计出一种能改善重联动车组重联区域空气动力学特性的多级车钩导流罩结构，并基于计算流体力学，分别建立重联动车组结构优化前后的两种空气动力学计算模型，通过数值仿真模拟了动车组在平地工况以350 km/h速度运行的基本气动性能，并对仿真结果进行对比研究。结果表明：新型车钩导流罩结构能够有效降低动车组平地运行阻力，总阻力可减小4.47%;列车表面压力分布、周围流场显示结果与阻力分布一致，该二级导流罩可以有效改善列车运行空气动力学性能。更多还原

【Abstract】 In this article, a multi-stage coupler dome structure is designed, which is helpful to improve the aerodynamic characteristics of the reconnection area of the reconnecting EMU. Besides, based on the computational fluid dynamics, the models of calculating the aerodynamics of the reconnecting EMU before and after structural optimizationare set up. The basic aerodynamic performance of the EMU running at a speed of 350 km/h on the flat ground is simulated by means of numerical simulation, and then the simulation results are compared. It is shown that the new coupler dome can effectively reduce the running resistance of the EMU on the flat ground, and the total resistance reduces by 4.47%; the pressure distribution of the train surface and the display results of the surrounding flow field are consistent with the resistance distribution. Threfore, the secondary domestructure ensures a higher standard of aerodynamicperformanceof running trains.更多还原