350 km/h高速列车过特长双线隧道时表面压力分布数值模拟分析

Numerical Simulation Analysis of Surface Pressure Distribution of 350 km/h High Speed Train Passing Through Extra Long Double Tunnel

基于三维定常不可压的黏性流场N-S及方程湍流模型,利用有限体积数值模拟方法分析计算出某型时速350km/h高速列车在明线及特长双线隧道内运行时的局部流场结构及压力波分布情况。研究发现:流场分布结构复杂且不规律,整体趋势上列车靠近隧道的一侧所受静压大于靠近中心线的一侧所受静压,同时迎风侧压力波动现象较为明显,且两侧所受静压沿列车长度方向逐渐减小;隧道方面:列车侧与无车侧内轮廓所受静压沿列车长度方向逐渐增大,然后于列车头部位置骤降并逐渐趋于平缓下降,到背风侧列车尾部位置突增达到一个极大值,然后逐渐下降并趋于稳定,列车侧内轮廓所受静压沿列车长度方向在靠近列车头车司机室部位,压力波动现象较为明显,且迎风侧压力波动现象较背风侧更为突出,无车侧基本无压力波动现象产生,轮廓静压分布沿着隧道底部逐渐向隧道顶部基本保持稳定。

Based on the three-dimensional constant incompressible viscous flow field NS and the equation turbulence model,the finite-volume numerical simulation method was used to analyze and calculate the local flow field structure and pressure wave distribution of a 350 km/h high-speed train operating on the long-haul lines and extra long double-track railway tunnels.The study finds that the distribution structure of the air flow field is complex and irregular.As for the train,the static pressure on the side of the train approaching the tunnel is greater than the static pressure on the side near the tunnel center line and the pressure fluctuation on the side of the front windward side.The phenomenon is more obvious,and the static pressure on both sides gradually decreases along the length of the train;As for the tunnel,the static pressure on the side of the tunnel with the train running and on the side without the train gradually increases along the length of the train,then it drops at the head of the train and gradually descends at the rear of the lee side train.The sudden increase reaches a maximum value,then gradually decreases and tends to be stable.The static pressure on the inner profile of the train is located near the driver’s cab of the train head along the length of the train.The phenomenon of pressure fluctuation is obvious,and the pressure fluctuation on the windward side is more obvious.The leeward side is more prominent,and there is almost no pressure fluctuation in the no-vehicle side,and the profile static pressure distribution is gradually stable along the bottom of the tunnel toward the top of the tunnel.