Unsteady Transition in an Axial Flow Turbine: Part 2 — Cascade Measurements and Modelling

Abstract

Part 1 of this paper reanalysed previously published measurements from the rotor of a low speed, single stage, axial flow turbine which highlighted the unsteady nature of the suction surface transition process. Part 2 investigates the significance of the wake jet and the unsteady frequency parameter. Supporting experiments carried out in a linear cascade with varying inlet turbulence are described together with a simple unsteady transition model explaining the features seen in the turbine.