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为了揭示航空煤油火蔓延过程中的火焰传播特性和油面温升规律,在自行研制液体火蔓延实验台的基础上,运用纹影摄像系统实时记录火蔓延的整个过程,分析了表面流和闪火焰出现的成因,探讨了不同燃油初温条件下表面流速度和火蔓延速度的变化规律.结合微细热电偶和红外热像测试技术,测量火焰前方未燃油面各点与中心线上的温度分布,揭示了在火蔓延过程中油面的温升规律,并发现燃油初温的升高使得表面流预热作用减弱.
In order to reveal the flame propagation characteristics and the rule of oil temperature rise during the fire spread of aviation kerosene, based on the self-developed liquid flame spread experiment bench, the whole course of fire spread was recorded by the shadow camera system in real time. The surface flow and flash The origin of flame and the variation law of surface flow velocity and fire propagation velocity under different initial fuel temperature conditions were discussed.Combined with the micro thermocouple and the infrared thermography test technique, the temperature distribution at each point and center line of unburned oil surface in front of the flame was measured , Revealed the law of temperature rise of the oil surface during the fire spread and found that the increase of the initial temperature of the fuel led to the weakened effect of the surface flow preheating.