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Use of a hybrid tabulated chemistry in the LES of lifted H2/N2 jet flame with autoignition

机译：在升降的H2 / N2喷射火焰中使用混合制表的化学与自燃

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Flame stabilization is a main concern in the design of practical combustion devices by use of new combustion concepts. Many novel techniques help reduce the pollutant emissions, but leads to the adverse effect of combustion instability. A multitude of subprocesses is involved in flame stabilization, such as autoignition and partially-premixed flame propagation, which pose a challenge for model. The current work presents a computational studv of turbulent lifted hydrogen flame diluted with nitrogen. A hybrid tabulated chemistry is proposed to simulate the turbulence-chemistry interaction that is vital for flame stabilization. This is achieved by use of the flame structures from both premixed and nonpremixed flamelet that is combined with a novel definition of flame index. The result demonstrates the good performance of present combustion model based on tabulated chemical kinetics. The lifted flame is well predicted in terms of gas temperature as well as species mass fraction.
机译：火焰稳定是通过使用新的燃烧概念设计实用燃烧装置的主要关注点。许多新颖的技术有助于减少污染物排放，但导致燃烧不稳定的不利影响。众多的子过程涉及火焰稳定，例如自燃和部分预混的火焰传播，这为模型构成了挑战。目前的工作呈现了用氮气稀释的湍流提升氢火焰的计算研究。提出了一种混合制表化学来模拟对火焰稳定性至关重要的湍流 - 化学相互作用。这是通过使用与预混和非增花鲨的火焰结构相结合的火焰指数的新颖定义来实现。结果表明了基于制表化学动力学的现有内燃模型的良好性能。在气体温度以及物种质量分数方面，提升的火焰很好地预测。

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