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2025 Vol.30, Issue 4 Preview Page

Research Article

Analysis of Combustion Instability of Hydrogen Mixed Retrofit Gas Turbine Nozzles

수소혼소 리트로핏 가스터빈 노즐의 연소불안정 특성 분석

Juhwan Lee1
,
Sojong Park2
,
Youngbin Yoon2
,
Seung Hyun Yoon3
,
Daesik Kim1†
이 주환1
,
박 소정2
,
윤 영빈2
,
윤 승현3
,
김 대식1†
1Department of Mechanical Engineering, Gangneung Wonju National University
2Department of Aerospace Engineering, Seoul National University
3Department of Smart e-Automobile, Yeungnam University College
1강릉원주대학교 기계공학과
2서울대학교 항공우주공학과
3영남이공대학교 스마트 e-자동차과
*Corresponding Author
31 December 2025. pp. 25-31
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Abstract

This study analyzed the combustion instability characteristics of retrofit and original nozzles in hydrogen-mixed gas turbines using a 1D thermoacoustic model. Experiments were conducted on a laboratory-scale test rig at hydrogen mixing ratios of 0%, 30%, and 50%. Both nozzles exhibited frequency shift phenomena with increasing hydrogen content, but showed opposite trends in dynamic pressure amplitude. The original nozzle showed decreased dynamic pressure amplitude with increasing hydrogen ratio, while the retrofit nozzle exhibited increased dynamic pressure amplitude. Analysis of experimentally measured flame transfer functions revealed that the retrofit nozzle exhibited longer time delay than the original nozzle under the same conditions. Root locus analysis confirmed that this difference in time delay is the key factor determining system stability. It was identified that the center cooling air in the retrofit nozzle induces flame lift-off, increasing the time delay.

Keywords
Combustion instability
Hydrogen co-firing
Flame transfer function
Thermoacoustic analysis
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Information
  • Publisher :The Korean Society of Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of the Korean Society of Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 30
  • No :4
  • Pages :25-31
  • Received Date : 2025-10-31
  • Revised Date : 2025-11-13
  • Accepted Date : 2025-11-13
  • DOI :https://doi.org/10.15231/jksc.2025.30.4.025
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