LAPSE:2023.35527
Published Article
LAPSE:2023.35527
Effect of Mixing Section Acoustics on Combustion Instability in a Swirl-Stabilized Combustor
Donghyun Hwang, Cheolwoong Kang, Kyubok Ahn
May 2, 2023
An experimental study was performed to investigate the characteristics of two different combustion instability modes in a swirl-stabilized combustor. The first is the eigenfrequency corresponding to the half-wave of the combustion chamber section, and the second is the quarter-wave eigenmode of the inlet mixing section. The purpose of this study is to understand the effects of the swirl number on each combustion instability mode and analyze their generalized characteristics. Premixed gases composed of hydrocarbon fuels (C2H4 and CH4) and air were burned by independently varying the experimental conditions. Three dynamic pressure transducers and a photomultiplier tube were installed to detect pressure oscillations and heat release fluctuations in the inlet and combustion chamber sections, respectively. A high-speed camera was used to capture the instantaneous flame structures. In the swirl-stabilized combustor, the bands of the dominant frequencies were strongly dependent on the swirl number of the swirler vane. When the swirl number was low, the entire combustion system was often coupled with the quarter-wave eigenmode of the inlet mixing section. However, as the swirl number increased, the combustion instability mode was almost independent of the mixing section acoustics. Analysis of the phase difference and flame structure clearly demonstrated the differences between each eigenmode. The results provide new insights into the effect of the resonance mode in the inlet mixing section on combustion instability, depending on the swirl number in the swirl-stabilized combustor.
Keywords
combustion instability, inlet mixing section, swirl number, swirl-stabilized combustor, turbulent lean premixed flame
Suggested Citation
Hwang D, Kang C, Ahn K. Effect of Mixing Section Acoustics on Combustion Instability in a Swirl-Stabilized Combustor. (2023). LAPSE:2023.35527
Author Affiliations
Hwang D: School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea
Kang C: School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea
Ahn K: School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea [ORCID]
Journal Name
Energies
Volume
15
Issue
22
First Page
8492
Year
2022
Publication Date
2022-11-14
ISSN
1996-1073
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Original Submission
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PII: en15228492, Publication Type: Journal Article
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https://doi.org/10.3390/en15228492
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