Experimental Research on Combustion Noise of Centrally Staged Premixed Swirl Flame

被引：0
|
作者：
Luo S.-B. [1 ]
Zhang Y.-H. [2 ]
Han X. [1 ]
Wang J.-C. [1 ]
Zhang C. [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Aero-Engine, Research Institute of Aero-Engine, Beihang University, Beijing
[2] School of Energy and Power Engineering, Beihang University, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 05期
关键词：
Aeroengine; Centrally staged; Combustion noise; Flame macrostructure; Lean premixed combustion; Premixed methane flame; Swirl flame;
D O I：
10.13675/j.cnki.tjjs.2207106
中图分类号：
学科分类号：
摘要：
An experimental study on the combustion noise of a premixed methane flame in a centrally-staged swirl burner at atmospheric temperature and pressure is carried out，focusing on the effects of experimental conditions and confinement structure on the combustion noise. The combustion noise sound pressure level was measured with a sound level meter，and the time-averaged images of the flame were taken with a DSLR camera with a CH* filter. The experimental results show that when the airflow of the main and pilot stages keeps constant，the total equivalence ratio and the stratification ratio have a significant effect on combustion noise，but the hydrogen addition seems to have no obvious effect. The pilot stage equivalence ratio plays a key role in the generation of combustion noise. As a result，the closer the pilot stage equivalence ratio is to 1.00，the greater the combustion noise. Under the same operating conditions，the combustion noise increases with the increase of the air split ratio. Changing the structure of the dump confinement with conical confinement can reduce the level of combustion noise. In this study，the corresponding relationship between combustion noise and flame macrostructure was preliminarily analyzed by combining flame images captured by a camera with a CH* filter. © 2023 Journal of Propulsion Technology. All rights reserved.
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