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首页> 外文期刊>Journal of Heat Transfer >A Numerical and Analytical Study of Thermally Driven Combustion Oscillations in a Perfectly Stirred Reactor
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A Numerical and Analytical Study of Thermally Driven Combustion Oscillations in a Perfectly Stirred Reactor

机译：完全搅拌反应堆中热驱动燃烧振荡的数值和分析研究

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摘要

The oscillatory behaviors of methane and hydrogen oxidation in a perfectly stirred reactor (PSR) are examined. The work explores the parameter spaces in which oscillatory combustion and ignition take place using heat transfer coefficient, mean residence time, and reactor wall temperatures as variables. An analytic model was developed using an eigenvalue analysis to determine the nature and stability of these oscillations. Both numerical and analytical studies suggest that combustion oscillations occur at the extinction turning point of the hysteresis curve or the boundary of combustion extinction. These oscillations are found to be driven by the coupling of the heat released from the reaction and the heat dissipation through the reactor wall, and these are unstable, which perhaps explains why they were never or rarely observed experimentally. In the case of hydrogen oxidation, we demonstrate the existence of two additional types of oscillations, namely, hybrid oscillation and oscillatory ignition, both of which occur at or near the turning point of ignition. These oscillations are stable and driven by detailed reaction kinetics. The numerical results for hydrogen oxidation were compared with previous experiments and found to be within 5 K of the observed wall temperature where oscillations were observed.
机译：研究了在完全搅拌反应器（PSR）中甲烷和氢氧化的振荡行为。这项工作使用传热系数，平均停留时间和反应堆壁温作为变量，探索了发生振荡燃烧和点火的参数空间。使用特征值分析开发了一个解析模型，以确定这些振荡的性质和稳定性。数值和分析研究均表明，燃烧振荡发生在磁滞曲线的消光转折点或消光边界处。发现这些振荡是由反应释放的热量与通过反应器壁的散热耦合而产生的，并且不稳定，这也许可以解释为什么从未在实验中观察到或很少观察到它们。在氢氧化的情况下，我们证明了存在两种其他类型的振荡，即混合振荡和振荡点火，这两种振荡均发生在点火的转折点或附近。这些振荡是稳定的，并由详细的反应动力学驱动。将氢氧化的数值结果与先前的实验进行了比较，发现该数值位于观察到的壁温波动的5 K之内。

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