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假定阴燃过程中 ,活性物、焦炭和灰三种物质的密度是恒定的 ,但它们各自占固体质量的份额随阴燃而改变 ,确定了阴燃过程固体颗粒的体积收缩速率及填充空隙率变化数学模型。对上方具有空气掠过的水平纤维质填充床 ,从点火到稳态传播的阴燃过程进行了模拟计算。计算结果表明 ,空隙率随阴燃过程增大 ,从而加快了阴燃传播速度 ,提高了其峰值温度。水平填充床表面下沉所引起的固 -固辐射换热在阴燃模拟计算中则可以忽略不计
Assuming the smoldering process, the active material, coke and ash three kinds of material density is constant, but their respective share of the solid mass changes with smoldering, to determine the smoldering solid particle volume shrinkage rate and filling porosity Change mathematical model. A horizontal fiber packed bed with air swept above was simulated by the smoldering process from ignition to steady state propagation. The calculation results show that the porosity increases with the smoldering process, accelerating the smoldering velocity and increasing the peak temperature. The solid-solid radiation heat transfer caused by the sinking of the horizontal packed bed surface is negligible in smoldering simulation