时速350km高速列车进隧道过程#br# 中瞬变压力变化规律研究

采用数值方法完成CRH380A高速列车进隧道的过程模拟，控制方程为三维、可压缩、非定常流动N-S(Navier-Stokes)方程，采用有限体积法进行计算域离散，利用滑移网格技术模拟列车与周围环境的相对运动。瞬变压力变化计算结果与国内现场试验结果基本一致。研究结果表明：列车进隧道过程中，瞬变压力变化过程可分为三个阶段，即初始压缩波引起压力增长、空气摩阻力引起压力增长、车头经过导致压力突降阶段；沿隧道纵向、同一横断面上最大正负压力值出现在不同位置，入口和隧道内气动压力均表现出显著的三维效应；列车偏心入隧道，近隧道侧气动压力值较远隧道侧气动压力值大，列车受到横向气动力作用。

The law of transient pressure in the process of #br# 350km/h high-speed train entering a tunnel

 The processes of CRH380A high-speed train entering a tunnel were completed through numerical method. The governing equations were the three dimensional, compressible, unsteady N-S (Navier-Stokes) equations. The finite volume method(FVM) was used to discretize the computational domain, and the sliding mesh method(SMM) was used to simulate relative movement of the train and its surroundings. The calculation results of transient pressure changes were basically consistent with the field measurement in China. The results show that the transient pressure change process can be divided into three phases: the pressure increases caused by the initial compression wave, the pressure increases caused by air friction, and the pressure drops caused by the headway passing. The maximum positive and negative pressures appear in different positions in longitudinal direction and the same cross section of the tunnel, and the aerodynamic pressure in the entrance and the tunnel shows significant three-dimensional effects. When the train enters eccentrically, the air pressures near the tunnel are greater than the far side of tunnel, the train is influenced strongly by lateral aerodynamics.