An investigation of performance degradation of steam turbine due to blades deterioration

Abstract

Steam turbine blade is damaged due to long time use and its performance gets worse. There are many studies about the relationship between performance and blades deterioration. However, most papers consider only a rotor or a stator deterioration. This paper presents a first stage model of an intermediate pressure turbine. The results show that the influence of the stator deterioration is more significant than the rotor, because the change of flow direction from stator affects the power. This paper also conducts a cascade experiment and compares experimental results and calculation result.