地铁隧道衬砌内毛细管换热器传热特性分析

Analysis of Heat Transfer Characteristics of Capillary Heat Exchanger in Metro Tunnel Lining

基于某实际工程,采用数值模拟的方法分析了地铁隧道衬砌内毛细管前端换热器(CHE)在全年典型运行工况下的传热特性,以期为CHE的设计提供理论指导。结果显示,在本研究参数设置下,随着地铁的运行沿CHE水流方向存在一临界点,临界点前后换热规律相差较大;过渡季可有效恢复围岩温度场,但无法完全消除CHE全年运行产生的热影响。

To provide theoretical guidance for the design of front-end capillary heat exchanger(CHE), numerical simulation was performed to analyze the heat transfer characteristics of the tunnel lining CHE under whole year typical operating conditions of an actual project. The results show that, under the parameter settings of this study, there is a critical point in the water flow direction of CHE when the subway runs, and the heat transfer law is quite different before and after the critical point. The surrounding rock temperature field can be effectively restored in the transition season, but the thermal impact by the annual operation of CHE cannot be completely eliminated.