Study On Numerical Simulation And Experimental Of Inclined Roadway Fire Based On FDS

At present,there are three methods to study mine fire at home and abroad,including experimental research,numerical simulation and theoretical calculation.Among them,it is difficult to build the experimental conditions consistent with the underground real environment in the experimental study,especially in the heat exchange between the fire smoke and the roadway surrounding rock,therefore,numerical simulation methods are often used to study mine fires.However,the accuracy of numerical simulation cannot be verified through real-life fires.In order to verify the accuracy of the method and principle of the numerical simulation,in this paper,the experiment of inclined roadway fire was conducted in the laboratory to obtain the real data of the fire experiment in the laboratory environment.The FDS software was used to simulate the fire experiment in the laboratory environment and analyze and compare.In this paper,the self designed tunnel fire experiment system is used to measure the temperature,wind speed and the pressure difference between the two ends of the tunnel in the non adiabatic iron model roadway with different inclination angles without mechanical ventilation.Simultaneous measurement of wall surface temperature variations of roadway models at different inclination angles,then calculate the heat absorption of the model roadway wall.And the heat absorbed by the wall of the model roadway decreases with the increase of roadway inclination angle.The same physical model as the experimental model was established using FDS,the wall adiabatic and non adiabatic conditions are simulated.It is concluded that the temperature,wind speed and pressure difference across the roadway in the tunnel under adiabatic conditions are higher than those under non-adiabatic conditions.The heat loss of the wall surface in the burning process has a great influence on the temperature field,velocity field and pressure field in the roadway.The temperature,wind speed and pressure difference across the roadway under non-adiabatic conditions are compared with the experimental data.The overall change trends of the two are better,but there are some differences in the results.The experimental measurements of temperature,wind speed and pressure in the initial and stable stages of fire development are all higher than those of the simulated values,The main reason for this is that the default model outside air temperature is a constant temperature during simulation.In practice,the wall surface of the model will exchange heat with the indoor air,and the room temperature will increase as the experiment progresses,thus affecting the simulation results.The effect of turbulence intensity on the convection heat transfer between the roadway wall and the high temperature gas is analyzed from the perspective of the turbulence intensity of the flow field in the roadway.Further verified the correctness of the numerical model.In summary,the heat exchange between fire smoke and surrounding rock must be taken into consideration when setting boundary conditions for simulated roadway fires in the future.