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Ammonia oxidation regimes and transitional behaviors in a Jet Stirred Flow Reactor

机译：氨氧化制度和喷射搅拌流量反应器中的过渡行为

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The present work was devoted to the experimental identification of combustion regimes for NH3/O-2 mixtures diluted in N-2 in a Jet Stirred Flow Reactor (JSFR). Low Temperature (LT) combustion and High Temperature (HT) combustion regimes were identified as a function of reactor temperature (T-r) and mixture equivalence ratio (phi). The shift between the identified regimes occurs at a noticeable system working temperature (1300 K), independently of the mixture composition. This shift may occur through a transitional Lower Reactivity (LR) regime for phi = 1 in-between 1300 and 1310 K. For fuel-lean conditions, damped temperature oscillations were recognized between 1310 and 1320 K.Different detailed kinetic mechanisms were used to simulate system reactivity. To some extent, kinetic models were able to reproduce the establishment of different kinetic regimes along with the dependence on system temperature and mixture composition. Kinetic analyses suggested that NH2 oxidation routes control the shift between LT and HT regimes along with the establishment of dynamic behaviors. The experimental results obtained in this work represent important constraints for a fine tuning of ammonia chemical kinetic mechanisms, with particular regards to intervals of parameters where the transition from LT to HT regimes occurs. Indeed, improving the models in these critical ranges will help seeking for possible fluid-dynamical and chemical strategies to improve combustion stability while reducing pollutants emissions. (C) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：本作本作致力于在喷射搅拌的流动反应器（JSFR）中在N-2中稀释的NH3 / O-2混合物的燃烧制度的实验识别。将低温（LT）燃烧和高温（HT）燃烧制度鉴定为反应器温度（T-R）和混合等效比（PHI）的函数。所识别的制度之间的偏移在明显的系统工作温度（1300k）中，独立于混合物组合物。这种偏移可能通过过渡的下反应性（LR）制度用于PHI＆ 1在1300和1310k之间。对于燃料稀薄条件，在1310和1320k之间识别阻尼温度振荡。使用的详细动力学机制识别出来模拟系统反应性。在某种程度上，动力学模型能够再现不同动力学制度以及对系统温度和混合组成的依赖性。动力学分析表明，NH2氧化路线控制LT和HT制度之间的偏移以及建立动态行为。在该工作中获得的实验结果代表了对氨化学动力学机制的微调的重要约束，特别是对来自HT对HT制度的过渡发生的参数的间隔。实际上，在这些关键范围内改善模型将有助于寻求可能的流体动态和化学策略，以提高燃烧稳定性，同时减少污染物排放。 （c）2021燃烧研究所。由elsevier Inc.保留所有权利发布。

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