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

被引：1

作者：

Kim, Myungho ^{[1
,2
]}

Kim, Kyu Tae ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Aerosp Engn, 291 Daehak Ro, Daejeon 34141, South Korea

[2] Agcy Def Dev, Aerosp Technol Res Inst, Daejeon 34186, South Korea

来源：

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | 2022年 / 36卷 / 07期

关键词：

Aero-engine combustor; Combustion dynamics; Dual swirl; Low frequency; Spray combustion; EXCITED AZIMUTHAL MODES; HEAT RELEASE RATE; COMBUSTION INSTABILITIES; MECHANISMS; DYNAMICS; OSCILLATIONS; TRANSITION; INJECTOR;

D O I：

10.1007/s12206-022-0627-3

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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.

引用

页码：3501 / 3508

页数：8

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