地铁车厢内气流组织的回风负压模拟

Negative Pressure Airflow Control Simulation of Subway Cars

由于地铁列车回风是靠风机的抽吸完成的,因此回风口是处于负压状态下的,为了弄清这个负压对车厢内部气流组织和温度分布的影响,建立了地铁列车三维k-ε模型,利用Fluent软件模拟了不同回风压力、排风口宽度和热负荷下车厢的内渗透风量、压力分布。结果表明:车厢内压降△P随着排风口宽度和车厢热负荷的增大而增大;当回风压力一定时,渗透风量随负荷增加而增加;当热负荷一定时,渗透风量随着压力增大而减小;当车厢负荷小于额定负荷即负荷100%时,可通过减小排风口宽度来减少渗透风量;当车厢热负荷大于100%时,可增大回风口压力来减少渗透风量。

In order to clarify the problem of the subway carriages negative pressure control, a three dimensional k-ε model is set up to simulate the railway carriage. The Fluent software is used to simulate the railway carriage air leakage under different outlet pressure, gap width, and thermal load. The result show, compartment pressure A P decreases with outlet width increases, increases with the increase of car load; when return air inlet pressure is constant, air leakage increases as the thermal load increases; when the heat load is constant, air leakage decreases as return air inlet pressure increases; when the thermal load is less than 100%, air leakage can be reduced by reducing the exhaust outlet width; when the heat load is greater than 100%, air leakage can be reduced by increasing the return air inlet pressure.