Study Of The Ventilation Network Solution Under Mine Tunnel Fire

When the tunnel on fire, as the underground space is relatively tight and narrow, much toxic smoke is produced and flows with the wind, which make the underground oxygen insufficient, the fire also make the airflow in a mess, and cause unnecessary personal property loss. Therefore, the study of throttle effect during fire and calculation method of ventilation network calculation has scientific significance in the study of ventilation system reliability, wind allocation, uniform pressure ventilation and the rescue plan formulating.In order to realize the calculation of accurate during the fire ventilation network in mine tunnel. Firstly，the resistance in fire area and mechanism of throttling effect are studied through the experiment of tunnel fire simulation model, throttling effect, fire scale and the relationship between the size of wind speed are obtained through the analysis of experimental data, and then with the help of combining the theoretical analysis and experimental simulation, the relationship between throttling effect and resistance in fire area is deduced, and so the fitting equations of throttle coefficient.Secondly, with the theoretical analysis of generating mechanism of roadway fire-wind pressure in fire period and the calculation method of fire-wind pressure, wind stability of sloping tunnels in mine which is affected by the fire-wind pressure and fire throttling effect is studied, and the changing rule of wind in tunnels that is associated with fire roadway after the fire is obtained, the relation discriminant in associated roadway when the direction of wind remains the same, the wind speed is zero, the wind flow is reverse deduced. Under simulation experiment of fire, with the recording and analyzing of changing situation of the temperature, speed and pressure about wind flow in angle associated roadway during fire period, the changing rule of wind in it is arrived at. With the method of changing working condition of ventilator fire in the end of fire, the influence to flow pattern in fire tunnel of changing it is studied.Finally, the calculation formula of wind resistance in each brand tunnel of ventilation network when fired and the fan air pressure are deduced, and with the improvement of calculating method about ventilation networks in normal times, improved Scott-Hinsley Iteration Method which is suited for r calculating of fire network in tunnel, and MATLAB is used to do computer programming with improved Scott-Hinsley Iteration Method according to ventilation network model of fire, then finally the computer calculating is achieved.