한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제21권6호
  • /
  • Pages.21-31
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  • 2017
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  • 1226-6027(pISSN)
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  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
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스크램제트 엔진에서의 모드 천이에 관한 수치해석 연구

Numerical Study on Mode Transition in a Scramjet Engine

  • Ha, Jeong Ho (Department of Mechanical Engineering, Andong National University) ;
  • Das, Rajarshi (Department of Mechanical Engineering, Andong National University) ;
  • Ladeinde, Foluso (Department of Mechanical Engineering, The State University of New York) ;
  • Kim, Tae Ho (Department of Mechanical Engineering, Andong National University) ;
  • Kim, Heuy Dong (Department of Mechanical Engineering, Andong National University)
  • 투고 : 2017.02.21
  • 심사 : 2017.08.09
  • 발행 : 2017.12.01
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초록

본 연구에서는 모드 천이가 발생하는 동안 상세한 유동 특성을 조사하기 위해, 이론분석과 수치해석을 수행하였다. 이론분석은 기존의 기체역학과 종래 보고된 이론식들 재정립하였으며, 수치해석은 2차원 비정상 압축성 Navier-Stokes 방정식을 풀기 위해 fully implicit finite volume scheme을 사용해 수행하였다. 해석의 검증을 위하여 실험 결과와 비교하였다. 격리부 입구 전온도와 수소 연료의 당량비를 변화시키면서 모드 천이에 미치는 영향을 조사하였다. 해석과 실험 결과는 정성적으로 잘 일치하였다. 당량비가 증가하면 스크램제트 모드에서 램제트 모드로 천이가 발생하였다. 이 때, 천이는 당량비에 따라 불연속적으로 나타나며, Non-allowable region이 존재하였다. 한편 격리부 입구에서 전온도의 증가는 모드 천이 경계를 변화시켰다.

In the present study, theoretical and numerical analyses have been carried out to investigate the detailed flow characteristics during the mode transition. The theoretical analysis rearranged the knowledge of gasdynamics and the previous studies, and the numerical analysis has conducted to solve the 2D unsteady compressible Navier-Stokes equations with a fully implicit finite volume scheme. To validate the numerical analysis, the experiment was compared with it. The total temperature at the inlet of isolator and the hydrogen fuel equivalent ratio were changed to investigate their effects on the mode transition phenomenon. As the results, the numerical analysis reproduced well the experiment qualitatively, the increment in the hydrogen fuel equivalent ratio induced the scram-mode to ram-mode transition which is discontinuous with a non-allowable region, and the variation in the total temperature changed the boundary of the mode transition.

키워드

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피인용 문헌

  1. Effect of Fuel Equivalence Ratio on Scramjet-to-Ramjet Mode Transition vol.22, pp.1, 2018, https://doi.org/10.6108/KSPE.2018.22.1.045