内置开孔隔墙高速铁路隧道列车车体压力波动特征

为研究内置开孔隔墙隧道内列车车体压力波动特征,基于有限体积方法的流体力学计算软件建立了非定常可压缩三维流动模型,对内置开孔隔墙高速铁路隧道内列车车体压力进行了计算分析。结果表明:隧道内置开孔隔墙后:①车体压力波形基本与无隔墙时一致,但波动程度加剧且出现有规律的周期振荡;②隔墙开孔间距和开孔面积对车体压力波的影响明显;③车体压力波幅值与车速成正相关关系,但其振荡周期与车速成反比;④相对于单车,列车对向运行时车体压力波明显增大,但两者的差值随着开孔间距的增大、开孔面积的减小和隧道长度的增加而减小。

Nature of Pressure Waves on Train Body in a High-speed Rail Tunnelwith Perforated Wall

In order to study the characteristics of the pressure waves on train body in a high speed rail tunnel with perforated wall, a 3D unsteady compressible viscous model was established by using computational fluid dynamics software based on finite volume method to calculate and analyze the pressure waves on train body in a high speed rail tunnel with perforated wall. The conclusions are as follows: After perforated wall being set up in tunnel, (1) the form of pressure wave on train body is basically the same as that without perforated wall, but the amplitude of fluctuation is intensified and regular periodic oscillation occurs; (2) the spacing of openings and opening area of partition wall have obvious influence on the pressure wave of train body; (3) positive correlation between the degree of fluctuation of pressure wave on train body and train speed is observed, but the oscillation period is inversely proportional to train speed; (4) Compared with the single train, the pressure wave of the train body increases obviously while two trains entering in tunnel in opposite directions. However, the difference between the two decreases as opening area decreases and the spacing of openings and tunnel length increase.