Transition and Loss Generation in the Profile Boundary Layer of a Turbine Blade

摘要

The profile boundary layer development on the blade suction side of a large-scale turbine cascade has been investigated by means of a two-component fibre-optic laser Doppler velocimeter. Measurements were detailed enough to allow constructing mean velocity and Reynolds stress boundary layer profiles giving an in-depth description of the boundary layer development through laminar, transitional and turbulent regimes. Data were used to evaluate turbulent and laminar deformation works, which constitute the main loss production mechanism in the profile boundary layer.