Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Investigation on Combustion Stability for Ammonia Co-Firing High-Swirl Combustor with Different Fuel-Air Composition by Flame Visualization

화염 가시화를 통한 암모니아 혼소 비예혼합 스월 버너의 연료-공기 조성에 따른 연소 안정성 분석

  • Hanyoung Kim (School of Mechanical Engineering, Pusan National University) ;
  • Eunkoo Yun (EPIC, Pusan National University) ;
  • Kyung Chun Kim (School of Mechanical Engineering, Pusan National University) ;
  • Sechul Oh (School of Mechanical Engineering, Pusan National University)
  • Received : 2025.04.24
  • Accepted : 2025.05.16
  • Published : 2025.05.31
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Abstract

This study experimentally investigates the flame stability and structure of a non-premixed high-swirl combustor fueled with NH3-H2 and NH3-CH4 mixtures. Power density ranged from 1.5 to 8 MW/m3, aligning with micro gas turbine scales, was investigated for the experiments. Lean blowout (LBO) limits, residence time, and momentum ratio were examined to assess stability characteristics. Flame visualization using OH and NH2 chemiluminescence revealed that even under lean conditions (φ = 0.37), flame was maintained near the nozzle due to strong recirculation, contrary to typical blowout trends. OH signals indicated compact and persistent reaction zones, while NH2 emissions highlighted rich-fuel regions. The results demonstrate that swirl-induced recirculation and hydrogen blending enhance flame stabilization under ultra-lean conditions, providing insights for future ammonia-based low-NOx combustion systems.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임.(No. 2020R1A5A8018822) 또한 본 연구는 2024학년도 부산대학교 교내학술연구비(신임교수연구정착금)에 의한 연구임.

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