Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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M4 Semi-Freejet Test with Full-scale Vehicle Model

실기체급 비행체 모델에 대한 M4 준자유류 시험

  • Juhyun Bae (The First R&D Institute, Agency for Defense Development) ;
  • Changwon Lim (The First R&D Institute, Agency for Defense Development) ;
  • Hojin Choi (The First R&D Institute, Agency for Defense Development) ;
  • Sangwook Jin (The First R&D Institute, Agency for Defense Development) ;
  • Jeongwoo Kim (Aerospace Technology Research Institute, Agency for Defense Development)
  • Received : 2022.07.19
  • Accepted : 2022.10.10
  • Published : 2022.10.31
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Abstract

Investigation on operation of the test apparatus for the M4 semi-freejet tests with a full-scale vehicle model was carried out utilizing domestic facilities. An integrated design of the experimental apparatus and the vehicle model was obtained through iterative computational fluid dynamics (CFD) analysis. The test results showed that the M4 nozzle of the apparatus was fully expanded to provide required test conditions. It was also found that the intake of the vehicle model successfully started, and the corresponding shadowgraph images were recorded during the test. A variable nozzle of the model was set to adjust the back pressure of the model combustor, and wall-static pressures were measured to obtain the pressure distribution at the main locations of the model. The flame of torch ignitors and pilot fuel ignition were observed in a flame-holder of the combustor.

국내 설비를 활용하여 실기체급 비행체 모델에 대한 M4 준자유류 시험을 수행하였다. 시험장치 및 비행체 모델은 반복적인 전산유체해석을 통해 통합적으로 설계/제작되었고, 해당 설비를 목표 시험 조건까지 가동하여 시험장치의 M4 노즐이 완전히 팽창하는 것을 확인하였다. 비행체 모델의 흡입구 주변의 가시화 영상을 획득하여 경사충격파가 생성되면서 비행체의 흡입구가 시동하는 것을 관측하였다. 비행체의 가변노즐을 구동하여 배압을 조절하면서 비행체 내부 유로의 벽면 압력 분포를 획득하였고, 연소기 내 화염안정화장치에서 점화용 토치 점화 및 점화보조제의 연소 현상을 관측하였다.

Keywords

Acknowledgement

본 연구는 국방과학연구소의 MJCC 다중복합사이클 신개념 극초음속 추진시스템 연구 및 이중램제트 추진기술 연구 과제의 지원을 받은 연구 결과이며, 본 시험을 수행하는데 협조해주신 국방과학연구소 산하 항공기술연구원 3부 및 (주)비츠로넥스텍 관계자분들께 감사드립니다.

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