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对小尺度庚烷薄油池火燃烧速率特性进行实验研究.测量了不同直径庚烷油池火焰高度、燃烧速率以及燃油温度随时间变化规律,计算了燃烧过程中燃油的液面温度和池壁热流密度.综合油池燃烧现象和各种测量参数提出了小尺度薄油池火的4个典型燃烧阶段,并探讨了池壁热流密度对油池沸腾燃烧的影响.结果表明:油池沸腾燃烧阶段的火焰高度和燃烧速率明显大于准稳态燃烧阶段;燃油液面温度在油池燃烧初期迅速上升至沸点,随后基本保持不变;池壁温度达到并超过燃料的沸点,从而在油池壁面上发生核态沸腾,是油池发生沸腾燃烧的条件.
The experiments were carried out to study the flame burning rate characteristics of small scale Heptane thin oil pool.The variation of flame height, burning rate and fuel temperature with different diameters of heptane oil tank were measured, and the surface temperature of fuel and the wall of fuel tank were calculated Heat flux density and heat flux density of the oil pool were analyzed.The four typical combustion stages of the small scale oil pool fire were put forward based on the combustion phenomenon of the oil well and various measurement parameters.The influence of heat flux density on the boiling of the oil pool was also discussed.The results showed that: The flame height and the combustion rate in the stage were significantly larger than those in the quasi-steady state combustion stage. The fuel surface temperature rapidly rose to the boiling point in the initial combustion period of the oil pool and remained basically unchanged. The temperature of the wall reached and exceeded the boiling point of the fuel, Occurrence of nuclear boiling, is the boiling conditions of the oil pool boiling.