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A stall‐delay model for rotating blades
Author(s) -
Dumitrescu Horia,
Cardos Vladimir
Publication year - 2007
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200700178
Subject(s) - airfoil , boundary layer , stall (fluid mechanics) , lift coefficient , mechanics , boundary layer thickness , flow separation , rotation (mathematics) , boundary layer control , limiting , lift (data mining) , wind tunnel , parasitic drag , incompressible flow , physics , turbine , compressibility , mathematics , geometry , engineering , reynolds number , mechanical engineering , computer science , thermodynamics , turbulence , data mining
Abstract The paper is aimed at describing a fundamental phenomenon: the effect of rotation on the inboard blade boundary layer on a wind turbine. The three‐dimensional incompressible steady momentum integral boundary‐layer equations are used to predict the boundary‐layer growth and limiting streamline angles on the blade surface for both attached and separating flow. The chordwise skin friction coefficient is used to identify boundary layer separation and shear layer reattachment locations. The nature of flow near the axis of rotation is discussed and the physical mechanism associated with 3‐D and rotational effects is identified. A semi‐empirical correction law for the lift coefficient based on 2‐D airfoil data is established. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)