Abstract
The present study is concerned with the low-frequency self-excited instabilities frequently occurring in aero-engine combustors operated with Jet A-1 fuel under pilot-mode non-premixed conditions. Here we perform extensive measurements of pressure oscillations and high-speed flame visualization to investigate several key aspects of non-premixed spray combustion dynamics associated with a dual-swirl pressure atomization nozzle. Our measurements show that the low-frequency instabilities in non-premixed combustion are intense at near-stoichiometric mixture ratios, with a strong negative correlation with inlet air temperature. The development of low-frequency instabilities is attributable to the interaction between several distinctive reaction regions with different characteristic timescales, involving periodically emerging partially-premixed flames near the injector face and downstream propagating non-premixed reaction regions.
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Myungho Kim is currently a Ph.D. candidate in Aerospace Engineering Department at KAIST and a Senior Researcher of Aerospace Technology Research Institute at ADD. His research interests include combustion instabilities in liquid-fueled aero-engine combustors and turbine aerodynamic design and analysis.
Kyutae Kim is an Associate Professor of Aerospace Engineering at KAIST. His research interests include experimental and theoretical investigations of combustion instabilities in aero-engine and heavy-duty gas turbine combustors — bulk, longitudinal, and transverse mode thermoacoustic phenomena in liquid- and gaseous fueled combustion systems.
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Kim, M., Kim, K.T. Experimental investigation of low-frequency instabilities of dual-swirl pressure-atomization spray flames. J Mech Sci Technol 36, 3501–3508 (2022). https://doi.org/10.1007/s12206-022-0627-3
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DOI: https://doi.org/10.1007/s12206-022-0627-3