Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Comparison of Exhaust Gas Recirculation and Excess Air Strategies for Improving Thermal Efficiency and Reducing Nitrogen Oxides emissions in Hydrogen Spark-ignition Engines at Low-load Operation

수소 스파크점화 엔진의 저부하 운전에서 열효율 및 질소산화물 배출 개선을 위한 배기가스재순환과 과잉공기 전략 비교

  • Hyunwook Park ;
  • Junsun Lee ;
  • Seungmook Oh ;
  • Yonggyu Lee ;
  • Changup Kim
  • 박현욱 (한국기계연구원 친환경모빌리티연구실) ;
  • 이준순 (한국기계연구원 친환경모빌리티연구실) ;
  • 오승묵 (한국기계연구원 친환경모빌리티연구실) ;
  • 이용규 (한국기계연구원 친환경모빌리티연구실) ;
  • 김창업 (한국기계연구원 친환경모빌리티연구실)
  • Received : 2024.03.19
  • Accepted : 2024.05.31
  • Published : 2024.06.30
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Abstract

This study compared exhaust gas recirculation (EGR) and excess air strategies for improving thermal efficiency and emissions of hydrogen combustion engines at low-load operation. The experimental investigation was conducted in a single-cylinder, heavy-duty engine under throttling and wide-open throttle (WOT) conditions. Although both EGR and excess air strategies reduced peak heat release rates and increased combustion durations, the net indicated thermal efficiencies were improved by reducing the pumping losses. Under the constraint of similar nitrogen oxides emissions, the EGR strategy had higher net indicated thermal efficiencies compared to the excess air strategy in throttling operation. However, the difference between their thermal efficiencies was reduced under WOT condition. The trend of reducing nitrogen oxides emissions according to the two strategies was similar.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 재원으로 한국산업기술기획평가원(KEIT)의 지원을 받아 수행한 연구과제입니다(No. 20018148 건설기계용 상용차용 300 kW급 Zero-CO2 수소 연소 엔진 시스템 및 저장 공급계 개발).

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