Generation and Development of Klebanoff Streaks in Low-Pressure Turbine Cascade Under Upstream Wakes

• DOI: 10.1115/gt2020-15313
• Publication Date: 2021-01-15T23:16:33Z
• Authors: Shuang Sun; Xingshuang Wu; Tianrong Tan; Canlin Zuo; Sirui Pan; Fulin Liu
• Keywords: Lift (data mining); Leading edge; Trailing edge

Abstract At low Reynolds numbers operating condition, the boundary layer of high-lift low-pressure turbine (LPT) aero-engines is prone to separate on suction surface airfoil. The profile losses airfoil are largely governed by size separation bubble and transition process in layer. However, wake-induced transition, natural instability induced Klebanoff streaks complicate process. a LPT was investigated at Re = 50,000 with upstream wakes. numerical simulation performed CFX software using large eddy simulations (LES), experiment linear cascade. In this study, wake divided into center tail, unsteady formation wall shear stress caused analyzed. A new mechanism generation development Streaks presented better understand effect Moreover, it found that after entering blade passage, does not contact but causes front part increase. possible form strong leading edge sheltering effect. Only tail can when contacts blade.