Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Study on Breakup Characteristics of Gel Propellant Using Pressure Swirl Injector

압력선회형 인젝터를 이용한 젤 추진제의 분열특성 연구

  • Cho, Janghee (Department of Smart Drone Convergence, Korea Aerospace University) ;
  • Lee, Donghee (Department of Smart Drone Convergence, Korea Aerospace University) ;
  • Kim, Sulhee (Department of Smart Drone Convergence, Korea Aerospace University) ;
  • Lee, Donggeun (Graduate School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Moon, Heejang (School of Mechanical and Aerospace Engineering, Korea Aerospace University)
  • Received : 2021.06.05
  • Accepted : 2021.09.21
  • Published : 2021.10.31
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Abstract

In this study, cold-flow test of simulant gel is conducted using a pressure swirl injector to identify spray characteristics according to gellant weight percent. Experiment results show the aircore is developed locally at the nozzle and expanded to the entire swirl chamber as the supply pressure increases. The aircore formation of simulant gel showed no significant difference compared to Newtonian fluid. The spray pattern was classified into four distinct shapes where relationship between the breakup regimes and dimensionless numbers were investigated. In the future, additional study is necessary to understand the aircore formation mechanism, stability and spray characteristics at different configuration of the swirl chamber shape.

본 연구에서는 압력 선회형 인젝터를 이용한 모사 젤 추진제의 분무실험을 수행하여 젤화제 첨가량에 따른 분무특성을 파악하였다. 실험을 통해 인젝터 내부의 공기층이 노즐에 국부적으로 형성되며 점차 와류실까지 확장되는 것을 확인하였으며 뉴턴 유체의 공기층 발달과정과 형상학적으로 유사한 경향성을 보였다. 분무형상은 4개의 유형으로 구분하였으며, 이를 공기층의 형성과정과 연관하여 형상학적으로 분석하였다. 분무형상을 바탕으로 일반화된 레이놀즈수, 웨버수 및 오네소지수와 같은 무차원 수에 따라 분열영역을 구분하였다. 추후 분무성능에 영향을 미치는 와류실 형상변화에 따른 공기층의 형상과 안정성, 이에 따른 분무특성에 관한 연구가 추가로 필요할 것으로 사료된다.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단-미래국방혁신기술개발사업의 지원과(NRF-2020M3F6A1110342) 2020년 한국연구재단 BK21 FOUR(과제번호 : 5199990714521)의 지원을 받아 수행된 연구임

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