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火源热释放速率的设定直接关系到火灾数值模拟与仿真的准确性。为研究多火源作用下的火灾热释放速率,通过对非稳态火源引起火灾的火势蔓延情况进行迭代分析,结合热辐射点燃机理,对单一火源引发其他可燃物共同燃烧的火灾建立了热释放速率等效合成模型,并通过对某型飞机客舱ULD内货物进行实例分析来加以验证。结果表明,等效合成模型的最大热释放速率受初始火源位置、可燃物的燃烧特性及其摆放位置的共同影响。
The setting of the rate of fire source heat release is directly related to the accuracy of numerical simulation and simulation of fire. In order to study the heat release rate of fire under the action of multiple fire sources, an iterative analysis was conducted on the fire spread caused by unsteady fire sources. Combining with the heat radiation ignition mechanism, a single fire source was set up to fire other combustible fires Heat release rate equivalent synthetic model, and by a certain type of cargo plane cabin ULD case analysis to be verified. The results show that the maximum heat release rate of the equivalent synthesis model is affected by the location of the initial ignition source, the combustibility of combustibles and their placement.