【摘要】 建立了一维自然扩散条件下阴燃传播和向有焰火转化的积分模型。材料阴燃的化学反应采用两步反应模型:无氧热解反应和有氧热解反应。前者是吸热反应,释放可燃气体,后者是放热反应,提供阴燃所需的能量。气相反应速率取决于可燃气体的浓度、氧气的浓度以及温度,一旦条件达到合适点,将出现有焰火。文中给出了自然扩散条件下阴然稳定传播时的速度,和能够出现有焰火所需条件的数学表达式,并与相关实验结果进行了对比。更多还原

【Abstract】 A one dimensional integral model has been developed to describe the propagation of smoldering and transition from smoldering to flaming with natural diffusion. A two-step reaction is included in the model: pyrolysis reaction and fuel oxidation .The pyrolysis reaction is an endothermic reaction and yields flammable gases ,while the fuel oxidation is exothermic .The transition to flaming occurs under some conditions. In this paper the velocity of smoldering propagation and the formulation that describes the condition of transition to flaming is deduced .The predictions of the model are compared with the experiment data.更多还原