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由液体和气体泄漏引发的喷射火灾事故屡见不鲜,而现有的喷射火模型却有诸多缺陷。将喷射火形状近似为圆锥,鉴于液体和气体的泄漏速度随压强和温度均有变化、点源离地面会有一定高度、风速对火焰倾角也有影响、圆锥喷射中心线上每个点源对目标的热辐射均不同等实际情况,新建液体和气体扩展半径的计算方法,引入风速对火焰高度和火焰偏角的作用,比较AGA法和Thornton模型,发现AGA法更加符合实际,再利用微积分原理建立三维点源喷射火模型,展示火焰形状对目标的影响,从而得出热辐射的最终危险性。最后以LPG和CNG储罐喷射火事故为例进行对比验证,首次模拟出喷射火的形状,更清晰准确地展示了目标入射热辐射通量随目标点位置的变化和危险范围,可为火焰阵面处的消防安全决策提供参考。
Jet fire accidents caused by liquid and gas leaks are common, but the existing jet fire models have many shortcomings. The shape of the jet fire is approximated as a cone. Since the leakage rate of liquids and gases varies with pressure and temperature, the point source will have a certain height from the ground and the wind speed will also affect the inclination of the flame. Each point source on the center of the cone jet pairs the target Heat radiation are not equal to the actual situation, the new liquid and gas expansion radius calculation method, the introduction of wind velocity on the flame height and flame angle, compared AGA method and Thornton model found that AGA method is more realistic and then use the principle of calculus The establishment of three-dimensional point source spray fire model, showing the impact of flame shape on the target, so as to draw the final danger of thermal radiation. Finally, the LPG and CNG tank fire accidents are compared and verified. The shape of the jet fire is simulated for the first time. The change of the target incident radiant flux with the target point and the dangerous range can be shown more clearly and accurately. Surface of fire safety decision-making for reference.