Study on Change of Blade Performance Due to Difference in Wake Characteristics of Upstream Stationary Cascade

Turbines are used in aeroengines and generators, and turbine blades generate power. In actual machine, the turbine is exposed to a harsh environment, so it is deteriorate due to factors such as thermal expansion, chipping, and wear. It is considered that the performance of the turbine blade and the flow field are greatly affected by the deterioration, and the efficiency is affected to a considerable extent. In this paper, in order to investigate how deterioration of the upstream stator affects turbine blade performance and flow field, a straight blade cascade test using a wake generator and CFD are performed. The wake of upstream stator can be simulated by moving a bar upstream of the rotor. The deterioration of the upstream stator can be simulated by changing the diameter of the bar, and the purpose of this study is to make a qualitative and quantitative comparison by investigating the influence of deterioration on the blade performance and the flow field around the blade.