Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Variations of the Low Cycle Fatigue Life of a High Pressure Turbine Nozzle Caused by Inlet Temperature Profiles and Installation Conditions

고압터빈 노즐에서 입구온도분포와 장착조건에 따른 저주기 피로 수명 영향에 대한 연구

  • Huh, Jae Sung (Aero-propulsion Research Office, Korea Aerospace Research Institute) ;
  • Kang, Young Seok (Aero-propulsion Research Office, Korea Aerospace Research Institute) ;
  • Rhee, Dong Ho (Aero-propulsion Research Office, Korea Aerospace Research Institute) ;
  • Seo, Do Young (School of Mechanical and Aerospace Engineering, Pusan Nat’l Univ.)
  • 허재성 (한국항공우주연구원 항공엔진연구단) ;
  • 강영석 (한국항공우주연구원 항공엔진연구단) ;
  • 이동호 (한국항공우주연구원 항공엔진연구단) ;
  • 서도영 (부산대학교 항공우주공학과)
  • Received : 2015.05.14
  • Accepted : 2015.09.05
  • Published : 2015.11.01
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Abstract

High pressure components of a gas turbine engine must operate for a long life under severe conditions in order to maximize the performance and minimize the maintenance cost. Enhanced cooling design, thermal barrier coating techniques, and nickel-base superalloys have been applied for overcoming them and furthermore, material modeling, finite element analysis, statistical techniques, and etc. in design stage have been utilized widely. This article aims to evaluate the effects on the low cycle fatigue life of the high pressure turbine nozzle caused by different turbine inlet temperature profiles and installation conditions and to investigate the most favorable operating condition to the turbine nozzle. To achieve it, the structural analysis, which utilized the results of conjugate heat transfer analysis as loading boundary conditions, was performed and its results were the input for the assessment of low cycle fatigue life at several critical zones.

항공기 및 엔진의 성능 극대화와 운용 유지비 최소화로 인하여 고압터빈 구성품은 점점 더 가혹한 환경에서 장시간 운용을 요구 받고 있다. 이를 해결하기 위해 냉각 극대화, 재료의 고급화, 코팅 기술 적용 등과 함께 재료 모델링, 유한요소해석, 통계적 기법 등의 수치적 해석 방법이 광범위하게 활용되고 있다. 본 연구에서는 일방향 응고 재료의 1 단 고압터빈 노즐의 운용 환경인 터빈 노즐 입구온도분포와 장착조건의 변화에 따른 노즐의 구조 건전성을 저주기 피로 수명을 통해 평가하고 가장 유리한 조건을 모색하고자 한다. 이를 위해 냉각 설계에 의한 노즐의 금속 온도 분포는 복합 열전달 해석을 통해 얻으며, 이를 근거로 탄소성 해석을 수행하고 그 결과를 기초로 저주기 피로 수명을 평가하였다.

Keywords

References

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