高速列车隧道通过对车内流场影响研究

Study on Air Flow Fieild When High-Speed Train Crossing Through a Tunnel

列车高速过隧道时诱发的压力波通过新风口传入车内,给旅客乘车舒适性带来严重影响.为验证高速列车隧道通过时空调系统的工作性能和探究车内流场的变化规律.构建列车车厢与空调管路系统的整体模型,基于计算流体力学方程,利用有限体积数值求解方法,引入数值传热项,模拟分析高速列车通过隧道时新风口压力变化对客室内流场产生的影响.结果表明：隧道通过时空调换气系统中的压头风机能有效抑制外界压力波动,使车内压力变化很小;车内温度变化范围在（297～299）K之间,满足舒适性要求;新风口压力的突然变化有可能导致客室内风速变化,变化幅值均小于0.5m/s,满足舒适性要求.可为高速列车空调系统的改进提供理论依据.

The pressure wave induced by high-speed train crossing through tunnel enters the carriage by the fresh air inlet,which brings serious influence on the passenger comfort.In order to verify the working of air-conditioning system and explore the changes of air flow fieild when high-speed train crossing through tunnel,it builds an entire geometry model for compartment and air-conditioning system of high-speed train,based on computational fluid dynamics （CFD） equations,using the finite volume method and the heat transfer equation,simulating and analyzing the influence of fresh air inlet change on airflow field when high-speed train crossing through a tunnel.The results show that,when high-speed train crossing through a tunnel,the air fan in the air-conditioningpipingsystem can inhibit the pressure wave outside effectively and greatly reduce the pressure changing inside compartments; the temperature changes in the range of （297～299）K,to meet the requirements of comfort; the sudden change of the fresh air inlet may cause the change of wind speed inside compartments,and the magnitude of change less than 0.5m/s,the results meet the comfort standard.The results can provide reference for the improvement of the air conditioning system of high-speed train.