The effect of mean flow on the intrinsic thermoacoustic instabilities in the duct and annular combustion chambers

Xiaokang Liu; Lizi Qin; Yan SongJingxuan LiLijun Yang

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The effect of mean flow on the intrinsic thermoacoustic instabilities in the duct and annular combustion chambers

机译：The effect of mean flow on the intrinsic thermoacoustic instabilities in the duct and annular combustion chambers

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Thermoacoustic instability in the combustion chamber of gas turbines, aero and rocket engines has become a topic concern. In this paper, a new instability phenomenon in the field of the thermoacoustic instability - Intrinsic ThermoAcoustic instabilities (ITA) is studied. The classic thermoacoustic instability is caused by the coupling among acoustic disturbances, flow fluctuations and heat release pulsations. When the influence of acoustic disturbance is removed, there is still a thermoacoustic instability phenomenon in the combustion chamber, which is known as ITA. In the previous research on ITA, the scholars found that the ITA is mainly determined by the flame response, but many scholars neglected the influence of the mean flow and entropy waves. In this paper, the influence of the mean flow on the ITA mode in the duct and annular combustion chambers is studied by constructing a low-order acoustic network model. At the same time, it also explores the influence of other parameters on the ITA mode. The mean flow greatly affects the growth rate of the ITA mode, and has little effect on its frequency in the duct combustion chamber model. This is also the main reason for neglecting the effect of mean flow on the ITA mode in previous studies. In addition, the influence of other parameters on the ITA mode is also reflected in the growth rate. In the annular combustion chamber, a new ITA mode, which does not meet the -π criterion, is found. And the increase of Mach number makes all ITA modes more unstable. The circumferential mode number has a great influence on the high frequency ITA mode. In addition, the ITA mode has a significant effect on the thermoacoustic mode of the system in the annular combustion chamber.

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来源
《Aerospace science and technology》 |2022年第8期|107691.1-107691.12|共12页
作者
Xiaokang Liu; Lizi Qin; Yan SongJingxuan LiLijun Yang;
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作者单位

School of Astronautics, Beihang University, Beijing 100191 China;

School of Astronautics, Beihang University, Beijing 100191 China,Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo, 315100, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Intrinsic thermoacoustic instabilities; Mean flow; The low-order acoustic network model; The duct combustion chamber; The annular combustion chamber;

The effect of mean flow on the intrinsic thermoacoustic instabilities in the duct and annular combustion chambers

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