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

The Korean Society of Mechanical Engineers (대한기계학회)
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Temperature-Dependent Stress Analysis of Rotating Functionally Graded Material Gas Turbine Blade Considering Operating Temperature and Ceramic Particle Size

운전온도와 세라믹 입자크기를 고려한 회전하는 경사기능성 가스터빈 블레이드의 응력해석

  • Lee, Ki Bok (Dept. of Mechanical Engineering, Hanyang Univ.) ;
  • Yoo, Hong Hee (Dept. of Mechanical Engineering, Hanyang Univ.)
  • 이기복 (한양대학교 기계공학과) ;
  • 유홍희 (한양대학교 기계공학과)
  • Received : 2013.11.23
  • Accepted : 2013.12.12
  • Published : 2014.02.01
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Abstract

Temperature-dependent stress analysis and heat transfer analysis of a rotating gas turbine blade made of functionally graded materials (FGMs) are presented considering turbine operating temperature and ceramic particle size. The material properties of functionally graded materials are assumed to vary continuously and smoothly across the thickness of the thin-walled blade. For obtaining system stiffness reflecting these characteristics, the one-dimensional heat transfer equation is applied along the thickness of the thin-walled blade for determining the temperature distribution. Using the results of the temperature analysis, the equations of motion of a rotating blade are derived with hybrid deformation variable modeling method along with the Rayleigh-Ritz assumed mode methods. The validity of the derived rotating blade model is evaluated by comparing its transient responses and temperature distribution with the results obtained using a commercial finite element code. The maximum tensile stress with operating speed and gradient index are obtained. Furthermore, the gradient index that minimizes blade temperature was investigated.

터빈의 운전온도와 세라믹 입자크기를 고려한 경사기능재료(FGM)로 만들어진 회전하는 가스터빈 블레이드의 열전달해석 및 응력해석을 수행하였다. 경사기능성 블레이드는 벽 두께에 따라서 연속적인 재료물성 변화를 나타낸다. 이러한 경사기능재료의 특성과 온도에 따른 열전 재료물성 변화를 고려하여 블레이드의 시스템 강성을 얻기 위해 블레이드의 열전달해석을 먼저 수행하였다. 이 열전달해석으로 얻은 시스템 강성으로부터 복합 변형 변수를 사용한 회전하는 가스터빈 블레이드의 운동방정식을 유도하였다. 유도된 운동방정식은 상용 유한요소 모델과 해석결과 비교를 통해 그 정확성을 입증하였으며 회전주파수와 구배 지수에 따른 최대 응력의 변화를 조사하였다. 또한, 열전달해석을 통해 가장 낮은 블레이드 온도를 나타내는 구배 지수를 조사하였다.

Keywords

References

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