Czasopismo
2007
|
Vol. 12, no 4
|
941-950
Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Warianty tytułu
Języki publikacji
Abstrakty
Blade rotation routinely and significantly augments aerodynam c forces during zero yaw horizontal axis wind turbine operation. To understand better the flow physics underlying this phenomenon, three-dimensional and rotational viscous effects on wind turbine blades are investigated by means of a 3-D boundary-Iayer model. The governing equations of the model are derived from 3-D primitive variable boundary-Iayer equations written in cylindrical coordinates in the rotating fratne of reference. The latter are integrated along the peripheral direction with the radial distance as parameter for a particular external flow. The skin friction coefficient is used to identify boundary layer separation and shear layer reattachment locations. Separation and reattachment kinematics shows at inboard locations that while the separation point location is not realIy atTected and remains near the leading edge, the reattachment point advances forward rapidly on the blade chord from the trailing edge as radial distance decreases. It is concluded that the rotational augmentation is linked to specific separation and reattachment state strictly determined by the Coriolis forces.
Rocznik
Tom
Strony
941-950
Opis fizyczny
Bibliogr. 12 poz., rys., wykr.
Twórcy
autor
autor
- "Caius Iacob" Institute of Applied Mathematics of the Romanian Academy P.O. Box 1-24, RO-70700, Bucharest, ROMANIA, v_cardos@yahoo.ca
Bibliografia
- Banks W.H.H. and Gaad G.E. (1963): Delaying effect of rotation on laminar separation. ( AIAA Journal, vol.1, No.4, pp.941.
- Cebeci T. and Cousteix J. (1999): Modeling and computation of boundary-layer flows. ( Berlin: Springer-Verlag, pp.381-393.
- Chaviarropoulos P.K. and Hansen M.O.L. (2000): Investigating three-dimensional and rotational effects on wind turbines blades by means of a quasi-3D Navier-Stokes solver. ( Journal of Fluids Engineering, vol.122, pp.330-336.
- Dumitrescu H. and Cardos V. (2004): Rotational effects on the boundary-layer flow in wind turbines. ( AIAA Journal, vol.42, No.2, pp.408-411.
- Himmelskamp H. (1945): Profile Investigation on a Rotating Airscrew. ( Technical Report PhD Disertation, Göttingen, Germany.
- Huyer S., Simms D. and Robinson M. (1996): Unsteady aerodynamics associated with a horizontal axis wind turbine. ( AIAA Journal, vol.34, No.7, pp.1410-1419.
- Schreck S. and Robinson M. (2002): Rotational augmentation of horizontal axis wind turbine blade aerodynamic response. ( Wind Energy, vol.5 No.2/3, pp.133-150.
- Schreck S. and Robinson M. (2003): Boundary layer state and flow field structure underlying rotational augmentation of blade aerodynamic response. ( Journal of Solar Energy Engineering (ASME), vol.125, pp.448-456.
- Sears W.R. (1950): Potential flow around a rotating cylindrical blade. ( Journal of Aeronautical Sciences, vol.17, No.3, pp.183-184.
- Shen W.Z. and. Sorensen J.N (1999): Quasi-3D Navier-Stokes model for a rotating airfoil. ( Journal of Computational Physics, vol.150, pp.518-548.
- Stratford B.S. (1959): The prediction of separation of the turbulent boundary layer. ( Journal of Fluid Mechanics, vol.5, pp.1-16.
- Tobak M. and Peake D.J. (1982): Topology of three-dimensional separated flows. ( Ann. Rev. Fluid Mech., vol.14, pp.61-85.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ2-0034-0028