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2024 Vol.29, Issue 1 Preview Page

Research Article

Amplification of Combustion Instabilities in a Lean-premixed Axially-staged Combustor due to Frequency Synchronization

희박 예혼합 다단 연소기에서의 주파수 동조에 의한 연소불안정 증폭

Yongseok Choi1†
,
Gyeonghyun Han1
,
Kyu Tae Kim1
최 용석1†
,
한 경현1
,
김 규태1
1Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology
1한국과학기술원 항공우주공학과
*Corresponding Author
31 March 2024. pp. 48-56
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Abstract

The self-excited dynamics of a lean-premixed axially-staged combustor, with respect to the characteristic acoustic frequency, were experimentally investigated by varying the hydrogen mole fraction in the primary flame while maintaining the fuel composition of the secondary flame constant. It is observed that the dominant instability frequency transitions from lower to higher acoustic modes with varying hydrogen concentrations during single-flame combustion. We demonstrate that under axially-staged conditions, the more complex instabilities can be triggered and sustained by the combination of local heat release fluctuations generated from the primary flame and secondary transverse reacting jets. When the instability frequencies of the primary and secondary flames synchronize with each other, especially within the same acoustic mode, the amplitudes of pressure fluctuations are significantly amplified compared to those observed with single flame condition.

Keywords
Combustion instability
Hydrogen
Axial fuel staging
Gas turbine combustion
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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 29
  • No :1
  • Pages :48-56
  • Received Date : 2024-02-27
  • Revised Date : 2024-03-15
  • Accepted Date : 2024-03-15
  • DOI :https://doi.org/10.15231/jksc.2024.29.1.048
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