Effects of swirler position on flame response and combustion instabilities  

作　　者：Liangliang XU Jianyi ZHENG Guoqing WANG Lei LI Fei QI 

机构地区：[1]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 210096,China [2]King Abdullah University of Science and Technology,Thuwal,Saudi Arabia

出　　处：《Chinese Journal of Aeronautics》2022年第3期345-355,共11页中国航空学报（英文版）

基　　金：supported the National Natural Science Foundation of China(Nos.51676126 and 51776191)。

摘　　要：This study is concerned with the experimental and theoretical investigation of the combustion instabilities in a premixed swirl combustor.It is focused on the effects of the swirl mixing distance on the intrinsic thermoacoustic mode.The swirler as an origin of the swirling flow is also the source of the flow disturbance,which has effects on the flame response.The location of the swirler is varied in the experiment to study the effect on combustion instabilities and flame transfer functions.A low order model is built to analyze the thermoacoustic instabilities of the combustion system.The experimental results show that the ITA switches from an unstable state to a stable state as the swirl mixing distance changes with an increment of 15 mm;while the instability of the quarter-wave mode is not varied.The measured Flame Transfer Functions(FTFs)show that the gain curves of the frequency-dependent FTFs seem to be stretched or compressed with the modulation of the swirler position,which has effects on frequencies and instabilities of thermoacoustic modes.With the low order model,the effects of flame response on combustion instabilities are analyzed and the flame dominant nature of the ITA mode is confirmed.

关 键 词：Intrinsic thermoacoustic instability Lean premixed combustion Mode switch Swirl flame Swirler position 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]