Countercurrent Layer And The Resistance Effect Research Of Downstream Ventilation Fire Roadway By Numerical Simulation

This article use a combination of theoretical analysis and software simulation tostudy the inclined tunnel’s fire flow. It provides reference for the prevention andtreatment of tunnel fire.Firstly, it introduces the form and damage of fire flow’s disorder during the mine fire,and theoretically explains the phenomenon is caused by the buoyancy effect and thethrottling effect. Derive the formula of the fire wind pressure and the fire zoneresistance. Introduce the reason, the process and the condition of the oppositedirection’s smoke flow. Then, use FLUENT to create a3D fire flow model of thedownward ventilation roadway. Do simulation of the temperature and pressure ofdifferent inclination. Draw the conclusion of horizontal and vertical section oftemperature distribution and the trend of pressure distribution. It show that thetemperature of the downwind side get lower and the pressure drop increase when thetunnel angel increases. Finally, combine FLUENT and MATLAB to conclude the firewind pressure of various working conditions. Conclude the fire wind pressure indifferent tunnel angel and the fire source’s intensity range from67.62Pa to450.34Pa.