Large-eddy simulation of a lean-premixed hydrogen flame in a low-swirl combustor under combustion instability

被引：4
|
作者：
Nagao, Jun [1 ]
Pillai, Abhishek Lakshman [1 ]
Shoji, Takeshi [2 ]
Tachibana, Shigeru [2 ]
Yokomori, Takeshi [3 ]
Kurose, Ryoichi [1 ]
机构：
[1] Kyoto Univ, Dept Mech Engn & Sci, Nishikyo Ku, Kyoto 6158540, Japan
[2] Japan Aerosp Explorat Agcy, Aviat Technol Directorate, Chofu, Tokyo 1828522, Japan
[3] Keio Univ, Dept Mech Engn, Yokohama, Kanagawa 2238522, Japan
来源：
PHYSICS OF FLUIDS | 2023年 / 35卷 / 10期
基金：
日本学术振兴会;
关键词：
SELF-EXCITED OSCILLATIONS; BOUNDARY-LAYER FLASHBACK; NUMERICAL-SIMULATION; GAS; MODEL; EMISSIONS; DYNAMICS; LES; PREDICTION; BURNERS;
D O I：
10.1063/5.0166412
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Large-eddy simulation (LES) of a lean-premixed hydrogen turbulent jet flame with combustion instability (CI) in a low-swirl combustor (LSC) is performed by employing a dynamically thickened flame model with a detailed chemical reaction model with 9 chemical species and 20 reactions, and the LES validity and the CI characteristics are investigated in detail. The results show that the present LES can accurately reproduce the experimentally observed characteristics of the CI such as intensity, frequency, sporadic decay of pressure oscillations, and a flame-flow interaction inducing the periodic transitions of an inverted conical flame structure and a flat flame structure in the LSC. The sporadic decay of pressure oscillations and the flame-flow interaction are caused by the temporal decoupling of pressure and heat release rate and the periodic outward and inward deflections of the inflow, which is associated with the flow behavior in the upstream injector channel, respectively.
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页数：19
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