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为分析油池火灾发展的一般规律,利用小尺度池火燃烧特性试验系统,对航空煤油池火的宏观和微观特性进行试验研究,重点分析质量燃烧速率、火焰涡流结构和火焰温度的变化规律。结果表明:燃烧速率方面,油品质量随时间近似呈线性变化,瞬时燃烧速率作为时间的函数分为5个阶段,火灾的有效防控必须放在初期;涡流结构方面,不同燃烧阶段火焰涡流结构的明显程度不同,与燃烧剧烈程度成反比关系,计算出涡流结构产生频率为4~5 Hz,其产生的原因是油品蒸发、燃烧流动与火焰浮力耦合作用的影响;火焰温度方面,就整个燃烧过程而言,竖直方向轴线上火焰下部温度明显高于上部,水平方向上火焰中心与火焰边缘未燃区之间温差随高度不同而差别较大。
In order to analyze the general law of oil pool fire development, the macro and micro characteristics of aviation kerosene pool fire were experimentally studied by using small-scale pool fire combustion characteristic test system. The changes of mass burning rate, flame eddy structure and flame temperature were analyzed emphatically. The results show that the quality of oil changes linearly with time, and the instantaneous combustion rate is divided into five stages as a function of time. The effective prevention and control of fire must be placed in the initial stage. In terms of eddy structure, flame turbulence structure The reason is that the frequency of eddy structure is 4 ~ 5 Hz. The reason is that the effect of the coupling between oil evaporation, combustion flow and flame buoyancy is affected. For flame temperature, In the combustion process, the temperature in the lower part of the flame in the vertical axis is obviously higher than that in the upper part. The temperature difference between the flame center in the horizontal direction and the unburned part in the edge of the flame varies greatly with different heights.