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

  • 제48권9호
  • /
  • Pages.717-724
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  • 2020
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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연소기 산화제 개폐밸브 닫힘 작동특성

Closing Characteristics of a Main Oxidizer Shut-off Valve

  • Hong, Moongeun (Launcher Propulsion Control Team, Korea Aerospace Research Institute Aerospace System Engineering Department, University of Science and Technology)
  • 투고 : 2020.05.15
  • 심사 : 2020.08.18
  • 발행 : 2020.09.01
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초록

본 논문에서 액체로켓엔진용 연소기 산화제 개폐밸브로 사용되는 밸브 개방 자체유지가능형 포핏 밸브의 밸브 닫힘 작동특성에 대한 연구 내용을 소개하기로 한다. 상온 및 극저온 환경에서 밸브 닫힘 특성을 예측할 수 있는 수치해석 방법을 제시하였으며, 시험결과와의 비교를 통해 계산결과의 신뢰성을 검증하였다. 본 연구를 통해 상온 및 극저온 작동 환경에서 각각 구동가스 배출 시스템의 유효 유로 면적과 밸브 작동부에 작용하는 운용유체의 압력 분포가 밸브의 전반적인 닫힘 작동특성을 좌우하는 주요 변수인 것을 확인하였다. 또한 극저온 작동 환경에서 구동가스를 적절히 활용함으로써, 밸브 닫힘 압력을 유연하게 조정할 수 있을 뿐만 아니라 밸브 닫힘 속도 또한 효과적으로 감소시킬 수 있음을 확인하였다.

We study the closing characteristics of a self-sustainable poppet valve which serves as a main oxidizer shut-off valve for liquid rocket engines. Numerical analysis for predicting closing transient responses are presented and the calculated results have been verified by a comparison with experimental data. The effective area of a pilot gas discharge system and the pressure distribution of passage flow around the valve moving part are shown to be main parameters in determining the closing characteristics for dry and cryogenic conditions, respectively. Moreover, it is presented that the passage flow pressure at the valve closing moment as well as the valve closing velocity can be effectively adjusted by the appropriate employment of the pilot gas.

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참고문헌

  1. Jeon, J. H., Hong, M. G., Kim, H. J. and Lee, S. Y., "A Study on the Force Balance of Main Oxidizer Shutoff Valve," Journal of the Korean Society of Aeronautical and Space Sciences, Vol. 37, No. 8, 2009, pp. 812-818. https://doi.org/10.5139/JKSAS.2009.37.8.812
  2. Kim, D. H., Hong, M. G., Park, J. S. and Lee, S. Y., "Study for the Development of a Main Oxidizer Shut-off Valve for Liquid Rocket Engines," Journal of the Korean Society of Propulsion Engineers, Vol. 17, No. 6, 2013, pp. 113-119. https://doi.org/10.6108/KSPE.2013.17.6.113
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  5. Hong, M. G., "Improvement of a Flow Coefficient for the Recirculation Chill-down Flow in a Main Oxidizer Shut-off Valve," Journal of the Korean Society for Propulsion Engineers, Vol. 21, No. 4, 2017, pp. 89-95. https://doi.org/10.6108/KSPE.2017.21.4.089
  6. Hong, M. G., "Opening Characteristics of a Main Oxidizer Shut-off Valve," Journal of the Korean Society for Aeronautical and Space Sciences, Vol. 45, No. 11, 2017, pp. 989-997. https://doi.org/10.5139/JKSAS.2017.45.11.989
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