Three-Dimensional Flows and Loss Generation Mechanisms in a Linear Turbine Rotor Cascade at Various Incidence Conditions

摘要

Effects of the incidence on cascade three-dimensional flows and on the associated loss mechanism occurring in a low-speed linear turbine rotor cascade are described. For five different incidences from 7.2 to -53.3 degrees, the cascade flow was surveyed in detail at fifteen or sixteen planes located axially throughout the cascade. Blade-to-blade flows at the cascade midspan and near the endwalls, meridional flows along the blade surfaces, and static and total pressures within the cascade were analyzed and the results were represented in three-dimensional forms using vectors, scalar contours and streaklines. New insight into the incidence effects and many quantitative experimental facts of turbine cascade flows are found.