Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Atomization Characteristics of Three Types of Swirl Injectors

세 가지 유형 와류 분사기들의 미립화 특성

  • 정하동 (충북대학교 기계공학과) ;
  • 안종현 (충북대학교 기계공학과) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2023.06.05
  • Accepted : 2023.06.20
  • Published : 2023.06.30
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Abstract

In this paper, the atomization characteristics of bi-swirl coaxial injectors for a 420 N-class bipropellant thruster were investigated. Three types of injectors, namely closed-type, open-type, and screw-type, were manufactured and designed to have the same spray angle and injection pressure drop. Water was used as a simulant, and cold-flow tests were conducted under ambient temperature and pressure conditions. Since the inner and outer injectors were designed to be the same type, only the inner fuel injectors that were easy to measure were used. Using a phase doppler particle analyzer, the velocity and diameter of atomized droplets were measured. Closed-type swirl injector exhibited droplet distributions with relatively high velocities and small SMD compared to the other two injectors. Open-type swirl injector formed droplets with reverse velocities in the center region and had a large recirculation zone. Screw-type swirl injector showed a sharp decrease in droplet velocity and size with radial distance from the liquid film breakup point. For the same design requirements, the closed-type swirl injector has superior atomization performance.

Keywords

Acknowledgement

본 논문은 과학기술정보통신부의 재원으로 한국연구재단(NRF-2021M1A3B9095872) 및 2023년도 방위사업청의 재원으로 국방기술진흥연구소(No. KRIT-CT-22-030, 재사용 무인 우주비행체 고도화 기술 특화연구센터)의 지원을 받아서 수행되었으며, 이에 감사드립니다.

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