Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Effects of Nozzle Shapes and Pressures on Boundary Layer Flashback of Hydrogen-Air Combustor

수소 전소용 연소 노즐 형상과 연소실 압력이 경계층 역화에 미치는 영향

  • WON JUNE, LEE (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials) ;
  • JEONGJAE, HWANG (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials) ;
  • HAN SEOK, KIM (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials) ;
  • KYUNGWOOK, MIN (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials) ;
  • MIN KUK, KIM (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials)
  • 이원준 (한국기계연구원 무탄소연료발전연구실) ;
  • 황정재 (한국기계연구원 무탄소연료발전연구실) ;
  • 김한석 (한국기계연구원 무탄소연료발전연구실) ;
  • 민경욱 (한국기계연구원 무탄소연료발전연구실) ;
  • 김민국 (한국기계연구원 무탄소연료발전연구실)
  • Received : 2022.12.16
  • Accepted : 2022.12.23
  • Published : 2022.12.30
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Abstract

Hydrogen combustion in modern gas-turbine engine is the cutting edge technology as carbon-free energy conversion system. Flashback of hydrogen flame, however, is inevitable and critical specially for premixed hydrogen combustion. Therefore, this experimental investigation is conducted to understand flashback phenomenon in premixed hydrogen combustion. In order to investigate flashback characteristics in premixed hydrogen (H2)/air flame, we focus on pressure conditions and nozzle shapes. In general, quenching distance reduces as pressure of combustion chamber increases, causing flashback from boundary layer near wall. The flashback regime for reference and modified candidate configurations can broadly appear with increasing combustion chamber pressure. The later one can improve flashback-resist by compensating flow velocity at wall. Also, improved wall flow velocity profile of suggested contraction nozzle prevents entire flashback but causes local flashback at nozzle exit.

Keywords

Acknowledgement

이 논문은 2022년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구이다(20206710100060, 분산발전 가스터빈용 수소 전소 저 NOx 연소기 개발).

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