Numerical investigation of the effects of turbulence on the ignition process in a turbulent MILD flame
Numerical investigation of the effects of turbulence on the ignition process in a turbulent MILD flame
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湍流对湍流 MILD 火焰点火过程影响的数值研究
DOI：
10.1007/s10409-021-01126-7
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发表时间：
2021-08
影响因子：
3.5
通讯作者：
Hong Yao
中科院分区：
文献类型：
--
作者：
Xiang Qian;Hao Lu;Chun Zou;Hanlin Zhang;Shujing Shao;Hong Yao
本文采用三维非线性大涡模拟方法研究了甲烷/氢气湍流射流在中、强低氧稀释（MILD）条件下的初始点火过程中湍流与反应的相互作用。特别关注的是火焰的空间发展和时间演变的代表点火点，其特征范围内观察到的点火行为的情况下。结果表明，火焰的点火过程由四个连续的阶段组成。点火最初发生在相对稀薄的混合物中，与相应的均质停滞绝热燃烧相比，与流动传输相关的自由基物质的损失导致点火延迟。在自燃阶段形成的初始点火点为火焰的稳定提供了充分的条件，包括提供各种关键自由基。研究还表明，伴随着热同向流的流动对流对火焰的缓慢传播起主导作用，湍流混合对火焰的快速传播起着重要作用。这些发现将拓宽我们对温和燃烧的了解，并为先进的点火控制提供有用的见解。
In this study, we conduct three-dimensional nonlinear large-eddy simulation to investigate the interaction between turbulence and reaction during the initial ignition process of a turbulent methane/hydrogen jet-in-hot-coflow flame under moderate or intense low-oxygen dilution (MILD) condition. Special focus has been placed on the spatial development of the flame and the temporal evolution of representative ignition spots that characterize the range of ignition behaviors observed in the case. Results show that the ignition process of the flame consists of four consecutive phases. Ignition occurs initially with relatively lean mixtures, and compared to the corresponding homogeneous stagnant adiabatic combustion, the loss of radical species associated with flow transportation causes a delay in ignition. The initial ignition spots formed during the autoignition phase provide sufficient conditions for the stabilization of the flame, including the provision of a variety of key radicals. Results also show that the flow convection accompanying the hot coflow dominated the slow flame propagation, and the turbulent mixing is of great importance for rapid flame propagation. These findings will broaden our knowledge of MILD combustion and provide useful insights into advanced ignition control.
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