航空エンジン用低圧タービン動翼非定常空力性能に与える上流側Wake特性の効果

Abstract

This study deals with experimental and numerical investigations on aerodynamic loss of two different types of low-pressure turbine (LPT) cascades. A special focus is placed on additional loss mechanism due to mixing of incoming wakes from the moving bars because there is still neither established consensus about the bar-mixing process nor any prediction method of incoming wake mixing loss. Two loss models developed by Denson as well as Coull and Hodson are employed to estimate steady-state (no wake condition) turbine cascade loss, which can be used to determine the mixing loss by comparing the steady-state and unsteady (wake condition) cascade losses. It is turned out that the aerodynamic loading of LPT cascade has some impact on the bar-wake mixing loss.