Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Performance Analysis of an Expansion Deflection Nozzle by Nozzle Length Reduction Method

노즐 길이 단축 방안에 따른 ED 노즐의 성능 분석

  • Joomi Lee (Department of Aerospace Engineering, Graduate School of Chungnam National University) ;
  • Junsub Choi (Department of Aerospace Engineering, Graduate School of Chungnam National University) ;
  • Hwanil Huh (Department of Aerospace Engineering, Chungnam National University)
  • Received : 2022.06.07
  • Accepted : 2022.10.15
  • Published : 2022.10.31
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Abstract

For the design of the shortened ED(Expansion Deflection) nozzle, a numerical study of ED nozzle was performed according to the length reduction methods. The first method is to reduce the extension length of the ED nozzle with 80% bell nozzle length by 10%, 20% and 30%. The second method is to shorten the extension length by increasing the nozzle throat angle. Due to the increase in the curvature of the contour as the length shortened, the decrease in the nozzle exit velocity between the ED nozzle with 80% bell nozzle length and the ED nozzle in the first method was reduced, and the thrust become similar. The ED nozzle of the second method increased the thrust by increasing the nozzle exit velocity compared to the ED nozzle with 80% bell nozzle length.

길이를 단축한 ED(Expansion Deflection) 노즐의 설계를 위해 길이 단축 방안에 따른 ED 노즐의 수치적 연구를 수행하였다. 첫 번째 방안은 80% 벨 노즐 길이를 갖는 ED 노즐의 확장부 길이를 10%, 20%와 30%씩 단축하는 것이다. 두 번째 방안은 노즐 목 각도를 증가시켜 확장부 길이를 단축하는 것이다. 길이 단축에 따른 윤곽선의 곡률 증가로 인해 80% 벨 노즐 길이인 ED 노즐과 첫 번째 방안의 ED 노즐의 출구 유동 속도의 감소폭이 줄어들어 추력이 유사해졌다. 두 번째 방안의 ED 노즐은 80% 벨 노즐 길이인 ED 노즐보다 출구 유동 속도가 증가하여 추력이 증가하였다.

Keywords

Acknowledgement

본 논문은 2021년 정부(과학기술정보통신부)의 재원으로 한국연구재단 스페이스챌린지사업(NRF2021M1A3B8078915)의 지원을 받아 수행된 연구입니다.

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