出口角度对防烟空气幕防烟效果影响的数值模拟

利用火灾动力学模拟软件FDS,以四川消防研究所高层实验塔二层为原型,模拟在不同防烟空气幕出口角度情况下高层建筑前室烟气运动情况,获得在其他条件不变情况下,空气幕运行时的最佳出口角度。试验结果表明:空气幕角度为5°及20°时,模拟试验后期烟气基本突破了空气幕蔓延至前室内,而当出口角度为10°和15°时防烟效果较好,且15°时防烟效果优于10°,故推荐空气幕运行时的最佳出口角度为15°。

Numerical Simulation on the Influence of Air Outlet Angles on the Effectiveness of Smoke preventing Air Curtain

The smoke movement rules in different outlet angles of air curtain were studied by using Fire Dynamics Simulator (FDS). The simulation was based on the second floor of the fire test tower in Sichuan Fire Research Institute of Ministry of Public Security. Through simulation, the optimal outlet angle of smoke-preventing air curtain, with other conditions unchanged, was found out. The results show that, when the outlet angle is respectively 5 degree and 20 degree, the fire smoke can move into the atria through the air curtain in the last stage of the simulation; when the outlet angle is respectively 10 degree and 15 degree, the effectiveness of smoke-preventing air curtain is better than others, especially much better when the angle is 15 degree. Therefore, the optimal air outlet angle of smoke-preventing air curtain is 15 degree.