BLADEROW INTERACTIONS, TRANSITION, AND HIGH-LIFT AEROFOILS IN LOW-PRESSURE TURBINES
- 1 January 2005
- journal article
- Published by Annual Reviews in Annual Review of Fluid Mechanics
- Vol. 37 (1), 71-98
- https://doi.org/10.1146/annurev.fluid.37.061903.175511
Abstract
▪ Abstract The flow in turbomachines is unsteady due to the relative motion of the rows of blades. In the low-pressure turbine, the wakes from the upstream bladerows provide the dominant source of unsteadiness. Because much of the blade-surface boundary-layer flow is laminar, one of the most important consequences of this unsteadiness is the interaction of the wakes with the suction-side boundary layer of a downstream blade. This is important because the blade suction–side boundary layers are responsible for most of the loss of efficiency and because the combined effects of random (wake turbulence) and periodic disturbances (wake velocity defect and pressure fields) cause the otherwise laminar boundary layer to undergo transition and eventually become turbulent. This article summarizes the process of wake-induced boundary-layer transition in low-pressure turbines and the loss generation processes that result. Particular emphasis is placed on how the effects of wakes may be exploited to control loss generation and how this has enabled successful development of ultra-high-lift low-pressure turbines.Keywords
This publication has 31 references indexed in Scilit:
- Large-scale vortical structure of turbulent separation bubble affected by unsteady wakeExperiments in Fluids, 2003
- Simulation of boundary layer transition induced by periodically passing wakesJournal of Fluid Mechanics, 1999
- Periodic Turbulent Strips and Calmed Regions in a Transitional Boundary LayerAIAA Journal, 1999
- Development of Blade Profiles for Low-Pressure Turbine ApplicationsJournal of Turbomachinery, 1997
- Boundary Layer Development in Axial Compressors and Turbines: Part 2 of 4—CompressorsJournal of Turbomachinery, 1997
- Boundary Layer Development in Axial Compressors and Turbines: Part 4 of 4—Computations and AnalysesJournal of Turbomachinery, 1997
- Boundary Layer Development in Axial Compressors and Turbines: Part 1 of 4—Composite PictureJournal of Turbomachinery, 1997
- Turbulence Measurements in a Multistage Low-Pressure TurbineJournal of Turbomachinery, 1989
- On a turbulent ‘spot’ in a laminar boundary layerJournal of Fluid Mechanics, 1976
- Wake Dispersion in TurbomachinesJournal of Basic Engineering, 1966