터빈 로터의 응력해석 및 수명평가

다국어 초록 (Multilingual Abstract)

The increasing size of steam turbines during recent years has resulted in corresponding increase in diameters of rotors. These larger rotor diameters lead to higher thermal stress in the rotor during start up. So the development of system for rotor life evaluation methodology becomes quite important. This system performs a computer program analysis for the remaining life evaluation of Y-Fossil turbine rotor as a sample.<br/>
Stress and thermal analyses were carried out by FEM (finite element method). In the case of the most severe starting condition(115% over speed), the maximum allowable non-metallic inclusion size was calculated through linear elastic fracture mechanics. And, regard of operating conditions(cold, warm, hot start), life consumption ratios were obtained by low cycle fatigue and creep theory.<br/>
FEM program ROTEMP(analysis of rotor temperature) was developed to calculate temperature distribution of the rotor by heat transfer from hot steam. And, stress and life evaluation analyses were calculated by the programs such as ROSTRS (analysis of rotor stress) and ROLIFE (analysis of rotor life), respectively. FEM codes used axi-symmetric, quadrilateral (or triangle) element.