Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Experimental Investigation on Water Hammer Phenomenon in the Recirculation Line of a Liquid Rocket Engine

액체로켓엔진 재순환 유로에서의 수격현상에 관한 실험적 연구

  • Kim, Bokyem (Aerospace System Engineering, University of Science and Technology) ;
  • Hong, Moongeun (Aerospace System Engineering, University of Science and Technology) ;
  • Lee, Jisung (Launcher Propulsion Control Team, Korea Aerospace Research Institute) ;
  • Kim, Junghan (Launcher Propulsion Control Team, Korea Aerospace Research Institute)
  • Received : 2020.12.02
  • Accepted : 2021.03.30
  • Published : 2021.04.30
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Abstract

In a liquid rocket engine system, the flow of oxidizer into the combustion chamber is controlled by the main oxidizer shut-off valve. When the valve is closed, the oxidizer flows via the recirculation line, not into the combustion chamber. In this situation, the measured pressure could be much higher than a design value because of the water hammer phenomenon. In this paper, the experiments on the water hammer in the recirculation line with different initial conditions were conducted in order to study the pressure wave produced in each case. According to the experimental results, characteristics of the pressure wave in the recirculation line depend on the initial condition. To be specific, the pressure surge is maximized in case that the shock is condensation-oriented in the end of the recirculation line.

액체로켓엔진의 구성품인 연소기 산화제 개폐밸브는 연소기에 공급되는 산화제를 제어한다. 밸브가 닫힐 때 산화제는 연소기 대신 재순환 유로로 공급되며, 이때 발생한 수격현상에 의해 설계 기준보다 큰 압력이 발생할 수 있다. 본 연구에서는 액체질소를 운용 유체로 사용하여 재순환 유로의 초기 조건에 따른 수격 시험을 수행하였으며, 그 결과 발생하는 압력파를 분석하였다. 초기 조건에 따라 재순환유로 내부 압력파의 경향이 달랐으며, 특히 재순환 유로 끝단에서는 응축에 의한 수격이 발생할 때 압력이 최대로 커질 수 있음을 확인하였다.

Keywords

References

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