Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Comparison of Supersonic Jet Characteristics between Hydrogen and Helium injected by Small-cone-angle Pintle-type Hydrogen Injector

수소 및 헬륨을 이용한 작은 원추각 핀틀형 수소인젝터의 초음속 제트 특성 비교

  • Gyuhan Bae ;
  • Juwan Lim ;
  • Jaehyun Lee ;
  • Seoksu Moon
  • 배규한 (인하대학교 기계공학과) ;
  • 임주완 (인하대학교 기계공학과) ;
  • 이재현 (인하대학교 기계공학과) ;
  • 문석수 (인하대학교 기계공학과)
  • Received : 2024.05.30
  • Accepted : 2024.06.16
  • Published : 2024.06.30
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Abstract

Understanding the fundamental characteristics of supersonic hydrogen jets is important for the optimization of combustion in hydrogen engines. Previous studies have used helium as a surrogate gas to characterize the hydrogen jet characteristics due to potential explosion risks of hydrogen. It was based on the similarity of hydrogen and helium jet structures in supersonic conditions that has been confirmed using hole-type injectors and large-cone-angle pintle-type injectors. However, the validity of using helium as a surrogate gas has not been examined for recent small-cone-angle pintle-type injectors applied to direct-injection hydrogen engines, which form a supersonic hollow cone near the nozzle and experience the jet collapse downstream. Differences in the physical properties of hydrogen and helium could alter the jet development characteristics that need to be investigated and understood. This study compares supersonic jet structures of hydrogen and helium injected by a small-cone-angle (50°) pintle-type hydrogen injector and discusses their differences and related mechanisms. Jet penetration length and dispersion angle are measured using the Schlieren imaging method under engine-like injection conditions. As a result, the penetration length of hydrogen and helium jets showed a slight difference of less than 5%, and the dispersion angle showed a maximum of 10% difference according to the injection condition.

Keywords

Acknowledgement

이 연구는 2024년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구임(과제번호: 20018473).

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