Lifetime prediction modeling of airfoils for advanced power generation

摘要: The use of gases produced from coal as a turbine fuel offers an attractive means for efficiently generating electric power our Nation's most abundant fossil resource. oxy-fuel and hydrogen-fired concepts promise increased efficiency low emissions on the expense inlet temperature (TIT) different working fluid. Developing technology materials is critical to creation these near-zero emission generation technologies. A computational methodology, based three-dimensional finite element analysis (FEA) damage mechanics presented predicting evolution creep fatigue in airfoils. We took first look at airfoil thermal distributions advanced systems CFD analysis. mechanics-based models were implemented user modified routine commercial package ANSYS. This was used visualize over airfoils turbines concepts, regions susceptible failure indentified. Model allows interaction between thus due processes acting separately one cycle will affect both rates next cycle. Simulation results various conductivity top coat. Surface maps created showing development TGO scale Al depletion bond coat.In conjunction with model development, laboratory-scale experimental validation executed evaluate influence operational compressive stress levels performance TBC system. coated single crystal coupons exposed isothermally air 900, 1000, 1100oC without load. Exposed samples cross-sectioned evaluated scanning electron microscope (SEM). Performance data collected image Energy-dispersive x-ray (EDX) employed study elemental distribution system after exposure. Nanoindentation mechanical properties (Young's modulus hardness) components their time.