火焰特征量对快速烤燃的影响

Influence of Flame Characteristics on Fast Cook-off

为研究快速烤燃下池火中火焰特征量对烤燃弹的影响,建立了池火的快速烤燃模型,得到了烤燃弹的传热特性,分析了烤燃过程中烤燃弹放置高度和油池尺寸对火焰特征量的影响。结果表明:随着烤燃弹放置高度的增加,烤燃弹表面最高温度区域由上表面转移到下表面,辐射热通量峰值由烤燃弹上方转移到烤燃弹下方;随着油池尺寸增加,烤燃弹各表面温度更加均匀,烤燃弹吸收的热通量增加,烤燃弹表面温度升高。因此,快速烤燃试验中烤燃弹的放置高度与油池尺寸均会对火焰特征量造成影响,进而影响烤燃弹的快速烤燃特性。

In order to study the influence of flame characteristics on cook-off bomb in pool fire under the condition of fast cook-off,a fast cook-off model of pool fire was established,and the heat transfer characteristics of the cook-off bomb were obtained,then the influences of the placement height of the cookoff bomb and the size of the oil pool on the flame characteristics during the burning process were analyzed.The results show that with the increasing placement height of the bomb,the highest temperature region of the bomb surface shifts from the upper surface to the lower surface,and the peak radiation heat flux shifts from the top to the bottom of the bomb.With the increasing size of the oil pool,the surface temperature of the bomb becomes more uniform,the heat flux absorbed by the bomb increases,and the surface temperature of the bomb increases.Therefore,in the fast cook-off test,both the placement height of the bomb and the size of the oil pool affect the flame characteristics,and then the fast cook-off characteristics of the bomb.