Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Cavitation Instability of Turbopump Assembly Test for KSLV-II

한국형 발사체용 터보펌프 조립체 시험에서의 캐비테이션 불안정성

  • Kim, Dae-Jin (Turbopump Team, Korea Aerospace Research Institute) ;
  • Choi, Chang-Ho (Turbopump Team, Korea Aerospace Research Institute) ;
  • Kim, Jin-Sun (Turbopump Team, Korea Aerospace Research Institute)
  • 김대진 (한국항공우주연구원 터보펌프팀) ;
  • 최창호 (한국항공우주연구원 터보펌프팀) ;
  • 김진선 (한국항공우주연구원 터보펌프팀)
  • Received : 2020.05.19
  • Accepted : 2020.07.14
  • Published : 2020.10.31
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Abstract

Turbopumps for liquid rocket engines are exposed to various cavitation instabilities under their operating conditions. The instabilities affect the stability of the turbopumps. To make sure of the stability of the turbopump of KSLV-II, the present work examined the characteristics of the cavitation instabilities during the turbopump assembly test. In the test, the LOx pump was operated under super-synchronous rotating cavitation and attached to uneven cavitation. In the vibration analysis of the fuel pump, the characteristic frequency by the super-synchronous cavitation of the LOx pump was clearly shown.

액체로켓엔진용 터보펌프는 작동 조건에서 캐비테이션 불안정성에 노출되며, 이는 터보펌프의 안정성에 영향을 미친다. 이를 확인하기 위해 터보펌프 조립체 시험 중 나타난 캐비테이션 불안정성의 특징을 살펴보았다. 시험 중 산화제펌프는 대표적인 캐비테이션 불안정성인 초조화 선회 캐비테이션과 부착 비대칭 캐비테이션에 노출되었다. 캐비테이션 불안정성이 발생되지 않는 조건에서 작동했던 연료펌프에서도 산화제펌프의 초조화 선회 캐비테이션에 의한 진동이 확인되었다.

Keywords

References

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