Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Effect of Geometrical Parameters on Spray Characteristics of Shear/Swirl Coaxial Injector

전단/와류동축 분사기의 형상학적 변수에 따른 분무특성 영향

  • 강철웅 (충북대학교 기계공학과) ;
  • 이신우 (충북대학교 기계공학과) ;
  • 정하동 (충북대학교 기계공학과) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2024.07.11
  • Accepted : 2024.08.25
  • Published : 2024.09.30
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Abstract

In this study, a cold-flow test was conducted under ambient conditions to investigate the impact of key geometrical parameters on the spray characteristics of coaxial injectors. Two types of injectors were examined: shear coaxial and swirl coaxial. The primary geometrical variables considered were the recess length and taper angle. The effects of each geometric parameter on the pressure drop, discharge coefficient, breakup length, and spray angle were analyzed. In the swirl coaxial injector, the recess length and the presence of taper affected the discharge coefficient more than in the shear coaxial injector. In terms of breakup length and spray angle, the shear coaxial injector and the swirl coaxial injector showed different results, due to the combination of the jet or swirl injection of the oxidizer and the geometrical variables of the injector. The breakup length and spray angle of the swirl coaxial injector were superior to those of the shear coaxial injector. It is expected that the swirl coaxial injector will have better combustion performance in hot-firing tests.

Keywords

Acknowledgement

이 논문은 2024년도 정부(방위사업청)의 재원으로 국방기술진흥연구소(No. KRIT-CT-22-030, 재사용 무인 우주비행체 고도화 기술 특화연구센터)의 지원 및 2024학년도 충북대학교 학술연구영역 사업의 연구비 지원을 받아 수행된 연구이며, 이에 감사드립니다.

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