固体推进剂燃烧诱发热烟气运动的大涡模拟

Large Eddy Simulation of the Fire and Smoke Flow Induced by Solid Propellant Combustion in a Shipboard Compartment

利用空间火蔓延与烟气运动的大涡模拟方法,探讨了固体推进剂燃烧时在舱室内形成的火蔓延和烟气的运动,计算出室内烟气温度、墙壁温度与地面热流密度随时间的变化,与试验结果相符合。计算结果表明,固体推进剂火灾初期室内的气体受到热烟气的挤压像受到活塞的推挤一样流出门口;顶棚温度出现位于靠近火源和通风口连接通道所处的垂直截面附近的局部高温区。顶棚的壁面温度比地面温度要高,火灾具有较强的通过钢制顶棚向上部舱室蔓延的趋势。

Based on the large eddy simulation（LES） of the space fire spread and smoke flow in an enclosure,the fire induced by the burning of missile propellant in a shipboard compartment is investigated.The calculated evolutions of the smoke temperature,the wall temperature and the heat flux on the floor agree with the test data.At the initial fire stage,the air in the compartment is pushed out through the door on the effect of the smoke jostle as a piston motion.The local high wall temperature at the ceiling appears near the line of the ceiling intersecting with the vertical plane where both the fire source and the exhaust exit are in.The wall temperature at the ceiling is higher than that at the floor,shipboard fires possess the violent trend extending up to the upper compartment through the steel shipboard.