Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Technology Review and Development Trends of Dual-Bell Nozzle for Altitude Compensation

고도 보정용 듀얼 벨 노즐 개발 동향과 기술 분석

  • Choi, Junsub (Department of Aerospace Engineering, Graduate School at Chungnam National University) ;
  • Huh, Hwanil (Department of Aerospace Engineering, Chungnam National University)
  • Received : 2015.04.12
  • Accepted : 2015.04.21
  • Published : 2015.05.01
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Abstract

Dual-bell nozzle can overcome the performance losses of the conventional bell-shaped nozzles which induced by off-design operations with either over-expanded or under-expanded exhaust flow and minimize the losses of the specific impulse. In United States, Rocketdyne analyzed thrust characteristics according to the shape of the expansion nozzle and NASA conducted hot firing tests with various altitudes. DLR, which is one of the research institute of the Europe, is carrying out research for the different cases of inflection angle, nozzle length and expansion ratio. MAI of Russia applied the slot nozzle to the expansion region in order to reduce the performance losses. In Asia, both the Japan and the India are researching on the dual-bell nozzle and Mitsubishi cooperation of the Japan registered its patent. In this paper, concepts and performance of dual-bell nozzle, which can compensate altitude, are investigated and trends of current research are summarized. It is necessary for Korea to research on the dual-bell nozzle for lucrative space development.

듀얼 벨 노즐은 일반적인 벨 형상 노즐의 문제점인 저고도에서의 과대팽창, 고고도에서의 과소팽창을 감소시키며, 이로 인해 손실되는 비추력을 최소화 할 수 있는 노즐이다. 미국의 Rocketdyne사에서는 확장 노즐의 형상에 따른 추력특성을 분석하였고, NASA에서는 고도에 따른 연소실험을 수행하였다. 유럽은 DLR을 중심으로 굴곡각, 노즐 길이, 팽창비 등에 따른 연구를 진행하고 있으며, 러시아의 MAI에서는 팽창부에 슬롯을 추가하여 추력손실을 줄일 수 있는 연구가 진행되고 있다. 아시아에서는 일본, 인도 등에서 연구가 진행되고 있고, 일본의 미쓰비시사에서 슬롯 노즐과 유사한 개념의 기술을 특허로 등록하였다. 본 논문에서는 고도 보정이 가능한 노즐로써 듀얼 벨 노즐의 개념 및 성능과 국외 연구 개발 현황을 정리하였다. 국내에서도 경제성 있는 우주개발을 위해 듀얼 벨 노즐에 대한 연구가 필요하다.

Keywords

References

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