摘要
搭建1.5 m×1.5 m×1.0 m的船舶封闭舱室火灾实验平台,以柴油池火为火源,对初始氧气体积分数为19%、20%、21%条件下的火灾演变特性进行研究。采用数值模拟和实验相结合的方法,分析舱内温度场和速度场的变化。研究结果表明:燃烧初期阶段,初始氧气浓度增加,靠近火焰根部的温升明显,而顶部区域的升幅较小;燃烧后期阶段,初始氧气浓度降低,火焰燃烧状态改变,燃烧速率和燃烧温度降低。初始氧气浓度的降低使舱内整体温度和空气流速下降,油池火燃烧速率随之下降。
The 1.5 m × 1.5 m × 1.0 m experimental platform of enclosed cabin was established, the diesel pool fire was used as the fire source, and the fire evolution characteristics under the conditions of initial oxygen volume fraction of 19%, 20% and 21% were studied respectively. The combination of numerical simulation and experiment was used to analyze the changes of temperature field and velocity field in the cabin. The results showed that: in the early stage of combustion, the initial oxygen concentration increases,the temperature rise near the root of the flame is obvious, and the increase in the top region is smaller; in the later stage of combustion, the initial oxygen concentration decreases, the flame combustion state changes, and the burning rate decreases, which causes the decrease of flame temperature. As the initial oxygen concentration decreases, the overall temperature and air flow rate in the tank decreases, and the fire rate of the oil pool decreases.
引文
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