Abstract Experiments of partial inerting on flame propagation of starch dust deflagration in a vertical duct were conducted to reveal the differences in flame structure evolutions. Particle pyrolysis and combustion behavior combined with time scale analysis are used to discuss the flame inerting mechanism. The results showed that the inerting process makes the flame front fuzzy, discrete and irregular. The thickness of flame reaction zone increases as O2 concentration decreases, while the preheat zone decreases accordingly. The pyrolysis rate always controls the flame propagation process under inerting conditions. With the decrease of O2 concentration, the control effect of pyrolysis rate is gradually weakened, and the effect of combustion reaction rate on flame propagation appears. A physical model of starch dust flame propagation under partial inerting is established, and the inerting process of dust pyrolysis and combustion on the flame structure evolution is further revealed.

中文翻译：

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部分惰化对管道内淀粉粉尘爆燃火焰结构的影响

摘要 通过对垂直风道中淀粉粉尘爆燃火焰传播的部分惰性实验，揭示了火焰结构演化的差异。粒子热解和燃烧行为结合时间尺度分析被用来讨论火焰惰化机制。结果表明，惰化过程使火焰锋面模糊、离散和不规则。火焰反应区的厚度随着 O2 浓度的降低而增加，而预热区相应地减少。热解速率始终控制着惰性条件下的火焰传播过程。随着O2浓度的降低，对热解速率的控制作用逐渐减弱，出现燃烧反应速率对火焰传播的影响。