Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Spray Characteristics of Additive Manufactured Swirl Coaxial Injectors with Different Recess Lengths

적층제조 와류동축형 분사기 리세스 길이에 따른 분무특성

  • Ahn, Jonghyeon (School of Mechanical Engineering, Chungbok National University) ;
  • Lim, Ha Young (Launcher Propulsion Control Team, Korea Aerospace Research Institute) ;
  • Ahn, Kyubok (School of Mechanical Engineering, Chungbok National University)
  • Received : 2021.10.26
  • Accepted : 2022.01.11
  • Published : 2022.02.28
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Abstract

Four swirl coaxial injectors with different recess lengths were manufactured using an additive manufacturing method. Single-injection and bi-injection cold-flow experiments were performed using water and air as simulated propellants in an atmospheric pressure environment. According to the recess length and propellant flow conditions, the injection pressure drop and discharge coefficient were investigated, and the breakup length and spray angle were measured using an image processing technique. In the bi-injection pressure drop and discharge coefficient results, the liquid-side injector was not affected by the recess. For the gas-side injector, however, the injection pressure drop increased and the discharge coefficient decreased as the recess length increased. The breakup length in the single-injection increased with the increase of the recess, but decreased in the bi-injection.

리세스 길이가 다른 4개의 와류동축형 분사기를 적층제조 방식으로 제작하였다. 상압 환경에서 물과 공기를 모사추진제로 하여 단일분사 및 혼합분사 수류실험을 수행하였다. 리세스 길이와 추진제 유량 조건에 따른 분사차압과 유량계수를 확인하였고, 이미지 분석을 통해 분열길이와 분무각을 측정하였다. 혼합분사 분사차압 및 유량계수 결과에서 액체 분사기는 리세스에 영향을 받지 않았다. 하지만 기체 분사기는 리세스 길이 증가에 따라 분사차압이 증가하고 유량계수가 감소하였다. 단일분사 시 분열길이는 리세스 증가에 따라 길어졌지만, 혼합분사에서는 반대로 감소하였다.

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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