Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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A Study on the Two-Phase Flow Transition and Atomization Characteristics in Effervescent Injectors

기체주입식 분사기의 이상유동 변화와 분무특성에 관한 연구

  • 이강영 (충북대학교 기계공학부) ;
  • 정하동 (충북대학교 기계공학부) ;
  • 강철웅 (충북대학교 기계공학부) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2022.08.22
  • Accepted : 2022.09.14
  • Published : 2022.09.30
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Abstract

Gas injection is a technique applied to improve throttling in liquid rocket engines and atomization in effervescent injectors. When a gas is injected into a liquid, it creates a two-phase flow inside the injector. The changes (bubbly flow, slug flow, annular flow, etc.) in the two-phase flow affect the injector's spray characteristics. In this study, cold-flow tests were performed by using three injectors with different orifice diameters and four aerators with different gas injection hole diameters. The experiments were done by changing the thrust ratio (liquid mass flow rate ratio) and gas-liquid mass flow rate ratio. Two-phase flow transition, breakup length, and discharge coefficient according to the injector/aerator design and flow conditions were investigated in detail.

Keywords

Acknowledgement

본 논문은 과학기술정보통신부의 재원으로 한국연구재단(NRF-2021M1A3B8077772, NRF-2021M1A3B9095872) 및 한국항공우주연구원(KARI-FR21C00)의 지원을 받아서 수행되었으며, 이에 감사드립니다.

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