ブレードの劣化がガスタービン性能に及ぼす影響

抄録

Nozzle guide vanes (NGVs) and rotor blades of gas turbines for thermal power generation are damaged due to erosion through long time operations. The deterioration of the NGVs and rotor blades can reduce of the turbine efficiency and the reliability. To understand the influence of the blade deterioration in detail, aerodynamic characteristics are examined numerically. The numerical simulations of a three-stage gas turbine were conducted for the new blade condition without deterioration and for the old blade condition with deterioration in the first stage. The numerical results were validated by comparing with a heat balance analysis based on the data obtained from a power plant during the operation.