Experimental investigation of low-frequency instabilities of dual-swirl pressure-atomization spray flames

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 i...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2022, 36(7), , pp.3501-3508
Main Authors: Kim, Myungho, Kim, Kyu Tae
Format: Article
Language:English
Subjects:
Air temperature
Atomizing
Combustion chambers
Control
Dynamical Systems
Engineering
Industrial and Production Engineering
Jet engine fuels
Mechanical Engineering
Original Article
Premixed flames
Pressure oscillations
Vibration
기계공학
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Summary: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.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-022-0627-3