高空机载灭火剂流动输运数值仿真

Numerical simulation of flow and transport phenomena for airborne fire extinguishing agents at high altitude

为探究高空环境对飞机货舱灭火系统内灭火剂流动输运动态的影响,采用Fluent软件对一小型“哈龙”1301机载灭火系统装置管网中灭火剂的流动输运进行数值建模与仿真模拟,计算得到10000 m及13000 m高空下“哈龙”1301灭火剂在管网内的输运和释放动态,并与海平面高度下灭火剂输运释放过程中压力、相体积分数及相变传质速率三个特征变量进行对比分析。结果表明,高空环境下灭火剂的输运释放遵循“三阶段”,但高海拔环境不利于灭火剂的流动输运。该研究结果可为优化机载灭火系统在高空环境下的流动输运能力提供理论依据。

In order to investigate the influence of high altitude environment on the dynamics of extinguishing agent flow and transport in aircraft cargo hold fire extinguishing system,this paper adopts Fluent software to numerically model and simulate the dynamics of extinguishing agent flow and transport in the pipeline network of a small Halon 1301 airborne fire extinguishing system device,and obtains the dynamics of transport and release in the pipeline network of Halon 1301 at altitude of 10000 m and 13000 m.The transport and release dynamics of Halon 1301 extinguishing agent in the pipe network at high altitude were calculated,and compared and analyzed with three characteristic variables,namely,pressure,phase volume fraction and phase change mass transfer rate during the transport and release process of extinguishing agent at the altitude of sea level.The results show that the transportation and release of extinguishing agents at high altitude follow the“three-phase”process,but the high altitude environment is not favorable to the flow and transportation of extinguishing agents.The results of this study can provide a theoretical basis for optimizing the flow and transport capacity of airborne fire extinguishing systems in high-altitude environments.