地铁阻塞通风的数值模拟

Study on Ventilation Blocking Computation in Subway

提出了模拟地铁通风的数学模型 ,采用一维不可压缩非定常流动模型和有限差分法发展和完善了地铁空气流动的数值计算方法。在流动模型中 ,考虑了空气与列车壁和隧道壁之间的摩擦 ,隧道横断面变化、隧道与竖井接口等变化。并对地铁内热源进行了分析 ,如列车运行产热、照明及辅助设备产热、人员散热等。对实际工程中最不利阻塞工况通风方案进行了模拟与分析 ,提出了最恶劣阻塞情况下保证空调冷凝器正常工作的通风措施和机械通风的合理配置 。

Gives a mathematical model that describes subway ventilation. The numerical computing method about airflow in subway is developed with a one dimensional unsteady incompressible airflow model and a finite difference method. In the air flow model are considered the friction caused by air between the train surface and the tunnel wall, the changes produced by the tunnel cross section and changes at the joint of the tunnel and the shaft. The various heat sources in subway are analyzed, such as the heat produced by train in motion, illumination, the operation of supplementary equipment, and the people. The different ventilation plans under the most adverse blocking conditions of some subways are simulated and analyzed. The paper offers ventilation measures to guarantee that the condensers of air conditioners can operate normally under the most adverse blocking condition and the rational supply of mechanical ventilation. The paper provides reliable theoretical basis and a powerful tool for the research and design of subway environmental control.