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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

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.

Keywords

Functionally Graded Materials;Rotational Motion;Stress Analysis;Heat Transfer Analysis;Gas turbine

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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