CFD Analog Simulation And Experiments Study On Ventilation And Fire Of Subway Stations

Along with the development of subway in city, researchers pay more and more attention to the subway environment and subway fire. To build good subway environment means not only to provide a safe and comfortable environment but also to reduce energy consumption, construction costs and operation costs.To select model equation properly and compartmentalize calculating mesh rationally is very important to the results of CFD numerical simulation. This paper compares the results of field tests and simulation, analyses the effects of turbulence model on temperature field and air distribution in subway system and draw the conclusion that the calculating results of two-equation are more accurate than those of zero equation. Calculating meshes are made up of many incontinuous parts in calculating district. In every part calculate the equation of airflow and heat transfer. The determination of calculating meshes has huge effects on calculating results, time consumption and conservation results. This paper gives the optimizing meshes.The purpose of field tests is to obtain the boundary condition and verify the feasibility of using turbulence model to simulate platform ventilation, which are the two important conditions of simulating ventilation scheme. This paper use CFD method to simulate temperature field and air distribution of an island platform in winter condition, and measure some experiment data under permit condition to compare with the results of simulation in order to prove the reliability of computer simulation and select some boundary conditions.Which environment control scheme should be selected depends on objective condition, construction cost, operation effect, etc. for the large difference of climatic conditions and temperature and humidity. This paper calculates the temperature field and air distribution of Shenzhen (south), Tianjin (north) and Shenyang (northeast) under summer condition. Optimizes the air distribution of island and side subway platform of Tianjin, compares air conditioning scheme and ventilation scheme of Shenzhen, and gives the suitable ventilation scheme. Analyses the economical efficiency of shield gate, the action of exhaust air under railway and top part exhaust using CFD simulation.This paper analog simulates temperature field and air distribution of some fire conditions using CFD method and analyses the effect of fire location and exhaust smoke level on temperature field and air distribution. The method of saltwater experiment belongs to small size simulation experiment. This paper makes saltwater experiment of platform fire and train fire and compares the results with computer simulation results.To testifie the reliability and applicability, this paper analyses and compares results of CFD method and substantive fire.The thesis develops a set of software of the simulation on subway station in Chinese.