鼓形动力集中动车组不同环境交会气动载荷数值研究

Numerical Study on the Aerodynamic Loads of Drum-Type Power Concentrated EMUs Passing by Each Other in Different Conditions

列车交会对车身产生冲击,影响车窗玻璃强度和空调进风性能等。为评估新研发的鼓形动力集中动车组不同情况下交会的车身压力变化,采用滑移网格技术,基于三维可压非定常雷诺时均方法和SST k-ω湍流模型,分析了隧道内不同线间距和不同车速,以及侧风环境下不同风速和不同车速的列车交会压力。结果发现,隧道内列车等速交会、相同线间距下,P_(max)、P_(min)和ΔP随车速增加而增大;同一速度下,P_(max)、P_(min)和ΔP随线间距增加而减小。风环境下列车交会,迎风侧列车的交会侧压力变化幅值最大。隧道内列车最大压力变化幅值远大于侧风下的压力幅值,隧道为侧风下的2.4~3.2倍。

The pressure waves induced by two trains passing by each other impact the car body,especially affecting the strength of window glass and the air intake of air-conditioning.To evaluate the intersecting pressure change of new drum-type power concentrated EMUs under different situations,this paper used sliding grid technology,based on three-dimensional,compressible,unsteady reynolds-averaged Navier-Stokes(URANS)method and SST turbulence model,to analyze the intersection pressure of trains in a tunnel and crosswind environment.The results show that under the same line spaces in a tunnel,P_(max),P_(min) and increase with the increase of train speed;at the same train speed,the pressure value of P_(max),P_(min) and decrease with the increase of line spaces.Under crosswinds,the intersection pressure values are the largest for the windward side train.The maximum pressure change amplitude of the train in the tunnel is much larger than that under the crosswind,and the pressure amplitude in the tunnel is about 2.4~3.2 times of that under the crosswind.