Strength Analysis Of High Temperature Blade For Ultra Supercritical Steam Turbine

With the development of ultra supercritical steam turbine technologies, strength of steam turbine is drawing more and more attentions. Nowadays, how to accurately evaluate strength under elevated temperature is a nodus in high-parameter steam-turbine design and verification. The blade is one of the most important parts of steam turbine. Operation safety of steam turbine-generator units is closely related to the reliability of rotating blades. The root & groove of high temperature blade bear the high power load for ultra supercritical (USC) unit which has high steam conditions. Hence, the properly analysis and evaluation of the blade strength during design is very necessary.For the safety demand, the paper analyzes and evaluates the strength of high temperature blade root & groove for USC turbine using the CFD & EFA method which is widely applied in engineering field. Take example for saluting the heat stress of an actual blade. Start with the solution of convective heat exchange coefficient using CFD method. The paper shows the process of interpolating CFD result to the FEA model using interpolating program and the solution method of the temperature field and stress field in turbine start-up. It offers the analysis procedure of heat stress, including the choice of calculating state, the setup of calculating parameter, the dispose and evaluate of calculating result. The choice of creep constitutive model, fitting method of creep parameter and the analysis process of creep stress are brief introduced. The evaluate criterion of blade strength including heat stress and creep stress analysis is offered to designer for reference.This analytical method has reference meaning in solving the design bottleneck and analyzing strength of turbine's high temperature blades.