论文标题
反应源对一维离散燃烧波传播的热惯性效应
Thermal inertia effect of reactive sources on one-dimensional discrete combustion wave propagation
论文作者
论文摘要
在目前的工作中，通过在预热区中引入颗粒的热惯性来增强离散火焰模型[1]。使用新模型研究了颗粒热惯性对一维离散燃烧波的火焰速度，传播极限和近限制动力学的影响。发现随着粒子热惯性的增加，由于颗粒的加热速率较小，离散火焰的传播速度降低。此外，与旧模型的预测相比，粒子热惯性扩展了传播极限。此外，在数学上证明，使用旧离散模型发现的离散火焰速度的解决方案的非物理分支是用于稳态离散火焰的传播极限的一组解决方案，其中包括粒子热惯性。还将使用新模型预测的火焰速度与使用连续模型在分析上确定的速度进行了比较，该模型考虑了凝结相的热惯性[2]。我们发现，随着颗粒热惯性的增加，两种模型预测的离散火焰速度都变得更接近。最后，当粒子热惯性足够大时，这两个模型不管热源的离散性质如何，因此可以限制火焰传播。粒子热惯性控制的火焰可以被视为一种新型的燃烧状态。
In the present work, the discrete flame model [1] is augmented by introducing the thermal inertia of particles in the preheating zone. The effect of particle thermal inertia on flame speed, propagation limits, and near-limits dynamics of one-dimensional discrete combustion waves is studied using the new model. It is found that, with the increase of particle thermal inertia, the propagation velocity of the discrete flame decreases due to a smaller heating rate of the particles. Besides, particle thermal inertia extends the propagation limits compared to the prediction of the old model. Furthermore, it is mathematically proven that the nonphysical branch of the solutions for the discrete flame speeds, found using the old discrete model, is a set of solutions for the propagation limits of steady-state discrete flames with particle thermal inertia included. The flame speed predicted using the new model is also compared with that determined analytically using a continuum model considering the thermal inertia of the condensed phase [2]. We find that the discrete flame speeds predicted by the both models become closer to each other with increasing particle thermal inertia. Finally, the two models converge regardless of the discrete nature of the heat sources when particle thermal inertia is large enough so that can limit the flame propagation. The particle thermal inertia controlled flames could be regarded as a new kind of combustion regime.
