Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effect of Shroud Split on the Performance of a Turbopump Turbine Rotor

터보펌프 터빈 로터의 슈라우드 스플릿이 성능에 미치는 영향

  • Lee, Hanggi (Turbopump Team, Korea Aerospace Research Institute) ;
  • Jeong, Eunhwan (Turbopump Team, Korea Aerospace Research Institute) ;
  • Park, Pyungoo (Turbopump Team, Korea Aerospace Research Institute) ;
  • Yoon, Sukhwan (Turbopump Team, Korea Aerospace Research Institute) ;
  • Kim, Jinhan (Turbopump Team, Korea Aerospace Research Institute)
  • Received : 2012.05.25
  • Accepted : 2013.04.29
  • Published : 2013.08.01
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Abstract

A blisk with rotor shroud is usually adopted in LRE turbine to maximize its performance. However it experiences the severe thermal load and resulting damage during engine stating and stop. Shroud splitting is devised to relieve the thermal stress on the turbine rotor. Structural analysis confirmed the reduction of plastic strain at the blade hub and tip. However, split gap at the rotor shroud entails additional tip leakage and results performance degradation. In order to assess the effect of shroud split on the turbine performance, tests have been performed for various settings of shroud split. For the maximum number of shroud splitting, measured efficiency reduction ratio was 2.65% to the value of original shape rotor.

액체로켓 엔진의 시동과 종료 시, 터빈에 가해지는 열충격을 완화시키기 위해 초음속 충동형 터빈로터의 일체형 슈라우드를 여러 조각으로 분할하는 방법을 고안하였다. 구조해석 수행결과 슈라우드 분할은 동익의 허브와 팁에 나타나는 소성변형량을 크게 줄일 수 있는 것으로 나타났다. 그러나 슈라우드 분할은 의도하지 않은 누설손실로 인해 성능손실이 불가피하며 이에 대한 정량적인 성능감소를 측정하기 위해 다양한 슈라우드 분할 형상에 대해 시험을 수행하였다. 연구대상 터빈의 경우 슈라우드 분할 수를 최대로 할 경우 설계점 효율은 2.65% 비율로 감소하는 것으로 나타났다.

Keywords

References

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