论文标题
Chapman-Jouguet Deflagration的传播机制
The propagating mechanism of Chapman-Jouguet deflagration
论文作者
论文摘要
对燃烧理论和行业安全至关重要。在这项研究中，研究了Chapman-Jouguet（C-J）的传播机制。首先，提出了三个型号，以使C-J爆炸前线切除。这三个模型是（a）将膨胀参数引入一维能量方程，（b）以增加化学反应模型的激活能，以及（c）通过人工方法将冲击波从火焰前部解矛。在C-J爆炸通过具有不同模型，化学反应动力学和数值方案的一维数值模拟将其解耦后，获得C-J的幻影。其次，讨论了C-J范围的传播机制。对于以约1/2 C-J爆炸的传播速度的C-J缩水，前导冲击波后面的静态温度太低，无法点燃燃烧。但是，引导冲击波诱导的流量的总温度足够高，可以点燃混合物。稀疏波会减慢诱导的流量，形成壁，其静态温度升高。火焰和前导冲击波以几乎相同的速度传播，流场的双层结构保持稳定。传播速度等于燃烧产物的声速，即约1/2 C-J爆炸速度。
The deflagration-to-detonation transition (DDT) process is of great importance to both combustion theory and industry safety. In this study, the propagating mechanism of Chapman-Jouguet (C-J) deflagration is studied. Firstly, three models are put forth to decouple the C-J detonation front. These three models are (a) to introduce an expansion parameter into the one-dimensional energy equation, (b) to increase the activation energy of the chemical reaction model and (c) to decouple the shock wave from the flame front by artificial method. The C-J deflagration is obtained after the C-J detonation is decoupled by one-dimensional numerical simulations with different models, chemical reaction kinetics and numerical schemes. Secondly, the propagating mechanism of C-J deflagration is discussed. For the C-J deflagration with a propagating velocity of about 1/2 C-J detonation, the static temperature behind the leading shock wave is too low to ignite the combustion. But, the total temperature of the flow induced by the leading shock wave is high enough to ignite the mixture. The induced flow is slowed down by the rarefaction waves form the wall and its static temperature increases. The flame and the leading shock wave propagate with almost the same velocity and the double-discontinuity structure of the flow field keeps stable. The propagating velocity equals to the sound speed of the combustion products, which is about 1/2 C-J detonation velocity.
