贫燃预混旋流火焰燃烧不稳定性的实验

郭志辉; 王帅; 李磊; 张澄宇; 孙晓峰

贫燃预混旋流火焰燃烧不稳定性的实验

北京航空航天大学能源与动力工程学院航空发动机气动热力科技重点实验室, 北京 100191

基金项目: 国防基础科研项目(K12300060702)

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出版历程
- 收稿日期: 2008-12-01
- 修回日期: 2009-02-26
- 刊出日期: 2009-12-28

Experimental study on combustion instability of lean premixed swirl flame

National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 实验研究了常温常压条件下贫燃预混旋流火焰的燃烧不稳定性.结果表明:不稳定燃烧时,火焰结构发生显著变化,呈现大尺度运动的特点.燃烧室所发生的燃烧不稳定性是纵向自激式振荡,是燃烧室与预混段之间的耦合,振荡频率由整个系统决定.随着当量比的提高,燃烧经历了由稳定到不稳定,并达到有限循环脉动的过程.流动脉动和火焰的相互作用,是激发和维持振荡的主要原因,需要深入研究不稳定燃烧性产生和得以维持的机理.
- 燃烧不稳定性 /
- 贫油预混火焰 /
- 旋流
Abstract: An experimental study was conducted on combustion instabilities in a lean-premixed swirl-stabilized combustor at atmospheric pressure and temperature.The result shows that the combustion instability occurred in the model combustor is self-excited under longitudinal oscillation mode,the premixing section resonates with the combustor at the unstable mode of the system,and the oscillation frequency depends on the whole system.The equivalence ratio was identified to have major impact on the onset of instabilities.With equivalence ratio increase,the combustion was transited from stable to unstable states,and reached a limit cycle at last.In the occurrence of instability,the flame became much shorter and penetrated into the corner recirculation.The instability mechanism probably stems from the strong interaction between flame dynamics and flow oscillations inside the combustor,but more work is needed to provide an in-depth physical understanding of the mechanisms to initiate and sustain combustion instabilities.
- combustion instabilities /
- lean premixed flame /
- swirl flow

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参考文献(7)

[1]	Candel S.Combustion dynamics and control:p rogress and challenges[C]//Proceedings of the Combustion Institute.Pitt sburgh,PA:The Combustion Institute,2002,29(1):1-28.
[2]	Schadow K C,Gut mark E.Combustion instabilit y related to vortex shedding in dump combustors and their passive contro[J].Progress of Energy and Combustion Science,1992,8:117-132.
[3]	Lieuwen T,Torres H,Johnson C,et al.Amechanism of combustion instability in lean-premixed gas turbine com-bustor[J].Journal of Engineering for Gas and Turbine and Power,2001,123:182-189.
[4]	Lee S Y,Seo S,Broda J C,et al.An experimental esti-mation of mean reaction rate and flame structure during combustion instability in a lean premixed gas turbine com-bustor[C]//Proceedings of the Combustion Institute.Pitt sburgh,PA:The Combustion Institute,2000,28(1):775-782.
[5]	Meier W,Weigand P,Duan X R,et al.Detailed character-ization of the dynamics of thermoacoustic pulsations in alean premixed swirl flame[J].Combustion and Flame,2007,150(1-2):2-26.
[6]	Huang Ying,Yang V.Bifurcation of flame structure in a lean-premixed swirl-stabilized combustor:transition from stable to unstable flame[J].Combustion and Flame,2004,136:383-389.
[7]	张欣刚,任静,徐治皋.湍流预混燃烧器燃烧自激振动的数值研究[J].燃气轮机技术,2007,20(3):23-28. ZHANG Xingang,REN Jing,XU Zhigao.Numerical in-vestigation of self-excited oscillation of turbulent premixed co mbustion[J].Gas Turbine Technology,2007,20(3):23-28.(in Chinese)