隧道内地铁列车局部阻力系数的数值模拟

利用计算流体力学软件STAR-CD,对地铁区间的事故工况(阻塞工况和火灾工况)下列车周围的气流分布进行模拟计算。根据局部阻力产生的原因和定义,核算出两种工况下的列车局部阻力系数;通过对比火灾和阻塞工况下沿程阻力损失差,核算出火灾工况下对应的摩擦阻力系数,为地铁区间通风网络法模拟提供重要依据。结合工程实例,介绍计算流体力学(CFD)和网络法联合模拟在区间设计中的应用情况。

Numerical Simulation of Local Resistance Coefficients of Subway Trains Moving in Tunnels

Simulation was carried out by means of commercial CFD software STAR-CD for the air current distribution around the subway train moving in a tunnel under the conditions of a traffic jam and a fire accident respectively.The local resistance coefficients of subway train under both conditions were calculated according to the definition of local resistance and the reasons of their generation.The friction coefficient in the condition of fire accident was calculated according to the comparison of the difference in frictional loss between fire condition and jam condition.The local resistance coefficients and friction coefficients provide an important basis for simulating ventilation in the subway tunnel by a network method.Taking a project for example,the application of CFD-network coupling simulation in subway tunnel design is introduced.