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

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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.
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Issue Date
2022-06
Language
English
Article Type
Article
Citation

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.36, no.7, pp.3501 - 3508

ISSN
1738-494X
DOI
10.1007/s12206-022-0627-3
URI
http://hdl.handle.net/10203/297161
Appears in Collection
AE-Journal Papers(저널논문)
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