Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Study for the Development of a Main Oxidizer Shut-off Valve for Liquid Rocket Engines

발사체 연소기용 산화제 개폐밸브의 핵심요소 기술 개발

  • Kim, Dohyung (Part#3 Aerospace R&D Center, Aerospace Division, Hanwha TechM) ;
  • Hong, Moongeun (KSLV-II R&D Program Executive Office, Korea Aerospace Research Institute) ;
  • Park, Jaesung (KSLV-II R&D Program Executive Office, Korea Aerospace Research Institute) ;
  • Lee, Soo Yong (KSLV-II R&D Program Executive Office, Korea Aerospace Research Institute)
  • Received : 2012.12.04
  • Accepted : 2013.11.03
  • Published : 2013.12.01
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Abstract

A main oxidizer shut-off valve (MOV) controls the supply of cryogenic liquid oxygen to the combustion chamber of liquid rocket engines by on/off operations. The main subjects to be introduced are not only the valve transient response during valve on/off procedures but also the characteristics of pneumatic and seat/poppet parts as core technologies in the development of the MOV, which is expected to be adopted for the Korea Space Launch Vehicle II. It is shown that the analytical prediction of the transient valve travel is in good agreement with experimental results. Friction and elastic forces on the valve moving part are quantitatively evaluated by structural analysis.

발사체 연소기용 산화제 개폐밸브는 비교적 간단한 개폐 작동을 통해, 액체산소를 연소기에 공급 또는 차단한다. 고압, 고유량, 극저온의 액체산소를 운용 유체로 사용할 뿐만 아니라, 설계유량 대비 밸브 차압 또한 낮아야 하는 상당히 까다로운 개발요구조건을 가지고 있다. 본 논문에서는 현재 개발 중인 연소기용 산화제 개폐밸브의 밸브 과도 응답과 같은 기본적인 밸브 특성과 함께, 밸브 성능을 좌우하는 핵심 부분이라고 할 수 있는 밸브 공압 구동부 및 포핏/시트부의 개발 내용을 소개하였다. 밸브의 과도 응답 특성 해석 결과가 시험 측정결과와 매우 잘 일치하는 것을 확인하였으며, 구동 공압부 및 포핏/시트부 구조해석을 통해 밸브 무빙파트의 접촉면 반발력과 마찰력을 정량적으로 평가하였다.

Keywords

References

  1. Park, H., Bae, Y., Jang, K., Lee, S., Hong, M. and Lee, S.Y., "Development of a Main Oxidizer Shut-off Valve for Liquid Rocket Engine," 60th International Astronautical Congress, Daejeon, Korea, Oct. 2-9, 2009.
  2. Jeon, J., Hong, M., Kim, H. and Lee, S.Y., "A Study on the Force Balance of a Main Oxidizer shutoff Valve," Journal of the Korean Society of Aeronautical & Space Sciences, Vol. 37, No. 8, pp. 812-818, 2009. https://doi.org/10.5139/JKSAS.2009.37.8.812
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  4. Bae, Y., Kim, D., Hong, M., Lee, S.Y. and Jang, K., "Study on the Performance Improvement of a Main Oxidizer shut-off Valve," Aerospace Engineering and Technology, Vol. 9, No. 2, pp. 63-72, 2010.
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