Research On the Application Mechanism of Water Mist Curtain Smoke Blocking And Heat Insulation In Tunnel Fires

Abstract

The tunnel has large traffic flow and many kinds of combustibles. Once tunnel fire occurs, it is easy to cause catastrophic consequences of mass death and mass injury. As a clean and efficient fire extinguishing technology, water mist curtain can be used in tunnels. Therefore, it is of great scientific significance and application value to study the mechanism of smoke shielding and heat insulation by water mist curtain. In this study, the formula for calculating the smoke momentum was obtained by establishing the vertical distribution formula of the temperature and velocity of the smoke, and the smoke resistance and heat insulation mechanism of the water mist curtain was studied by using the ratio of the momentum of the water mist curtain system to the momentum of the smoke. The paper employs numerical simulation and theoretical analysis to determine the optimal momentum ratio. The results indicate that when the momentum ratio is optimal, the water mist curtain can effectively settle the smoke layer, and the simulation results are quantitatively validated. It is helpful for prevent the occurrence and spread of tunnel fires.

Keywords: tunnel fire, Numerical simulation, Water mist curtain, Smoke blocking and Heat insulation.