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Characteristics of High-Frequency Combustion Instabilities Occurring in Combustion Devices  

Seo, Seong-Hyeon (한밭대학교 기계공학과)
Publication Information
Journal of the Korean Society of Combustion / v.17, no.1, 2012 , pp. 30-36 More about this Journal
Abstract
Dynamic characteristics of combustion occurring in various combustion devices have been extensively studied since most of high-performance combustion devices are susceptible to hazardous, unstable combustion that deteriorates combustor's lifetime. One of the most severe unstable combustion phenomena is high-frequency combustion instability in which heat release fluctuations from combustion are coupled to resonant modes of the combustor. Here in this study, characteristics of high-frequency combustion instabilities observed in three different combustion devices have been presented. Lean-premixed combustion instability occurs mainly due to equivalence ratio fluctuations which induce large heat release oscillations at lean conditions. Liquid-fueled combustion also shows high-frequency instability from energy coupling between pressure and heat release oscillations.
Keywords
Combustion instability; Dynamics; Lean-premixed; Liquid fuel; Injector; Bulk mode; High-frequency; Coaxial; Impinging;
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