无火源释放后冷气溶胶灭火剂运动过程的数值模拟

Numerical simulation of superfine powder extinguishing agent movement released in non-fire room

采用Fluent软件对无火源释放后冷气溶胶灭火剂运动过程进行数值模拟并与实验结果进行对比分析。模拟结果表明:灭火剂微粒释放后主要受驱动气体控制先运动到灭火室底部,受到底部撞击后向上折返到达灭火室顶部,0.5 s左右已有灭火剂微粒到达灭火室顶部;装填1 000 g灭火剂的灭火室内微粒浓度高于500 g的;在1.2MPa的喷射压力下,500和1 000 g 2种充装量灭火剂的弥漫特性均较好;在1.0和1.2 MPa的喷射压力下,2种充装量灭火剂释放后的全淹没效果形成时间较快。与实验对比发现,模拟结果浓度曲线与实验结果有所差别,但是对于灭火剂整体运动情况,两者基本一致。

The Fluent software was used to simulate the superfine powder extinguishing agent movement released in non-fire room,and then a comparative study was made between simulation and experiment results.The results showed that after the fire extinguishing agent particles being released,those particles were mainly controlled by drive gas and moved to the bottom of the fire room firstly,and then,returned up to the top of the fire room after being hit by the bottom.Some particles reached to the top of the fire room at 0.5 s.For the fire rooms filled with 500 and 1 000 g extinguishing agent,the particle concentration of the latter room was higher than the former one in the simulation.The diffuse characteristic was better under 1.2 MPa injection pressure and it took less time for forming total flooding condition under 1.0 and 1.2 MPa injection pressure.The concentration curve of the simulation was different from that of the experiment,but the movement process of fire extinguishing agent particles was the same compared with experimental results.