Study On The Thermal Environment Of Subway Station And Tunnel Surrounding Rock Heat Transfer

ABSTRACT:The subway system has become a kind of widely used traffic system, environmental problems of subway station is increasingly outstanding. The environmental control system in subway station is an essential component, which can regulate the internal ambient air quality, improve comfort and can ensure the safe operation of subway system. Therefore, research on the subway internal environment and its control system will become an important issue for a long period.With the "quality monitoring analysis and forecasting applied research on Beijing subway internal environment" as the background, the thesis’s research object is Fuxingmen subway station. The thermal environment and tunnel temperature field in subway station are analysized by the actual site observation, and combining method of theoretical analysis and numerical simulation.In this paper, the distribution of the internal thermal environment and temperature field of tunnel are introduced, and the analysis principle and method are discussed. According to the actual flow field, mathematical models of air flow and heat transfer in subway are built based on the mass conservation equation, momentum conservation equation, energy conservation equation and K-s equation. The boundary conditions of numerical simulation and test data contrasted to the simulated results are obtained by the tests in the subway. The physical model is established by computational fluid dynamics (CFD) software PHOENICS. The heat distribution inside the subway station is obtained by entering the appropriate boundary conditions, meanwhile, the tunnel temperature field is simulated by Ansys software.The innovation points of this thesis are:1) the maximum amount of stored heat of tunnel surrounding rock are defined by numerical simulation;2) temperature field distribution on the future operation of the tunnel surrounding rock predicted by numerical simulation;3) the discipline of heat production of the surrounding rock tunnel is explored;4) the heat distribution in the subway station is validated by numerical simulation and test data.