Numerical Analysis of the Influence of Tip Devices on the Power Coefficient of a VAWT
Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 33122
Numerical Analysis of the Influence of Tip Devices on the Power Coefficient of a VAWT

Authors: Federico Amato, Gabriele Bedon, Marco Raciti Castelli, Ernesto Benini

Abstract:

The aerodynamic performances of vertical axis wind turbines are highly affected by tip vortexes. In the present work, different tip devices are considered and simulated against a baseline rotor configuration, with the aim of identifying the best tip architecture. Three different configurations are tested: winglets, an elliptic termination and an aerodynamic bulkhead. A comparative analysis on the most promising architectures is conducted, focusing also on blade torque evolution during a full revolution of the rotor blade. The most promising technology is concluded to be a well designed winglet.

Keywords: Darrieus Wind Turbine, Tip Devices, Tip Vortexes, Winglet, Elliptic Termination, Aerodynamic Bulkhead

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070233

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2243

References:


[1] M. Freestone, "Aerodynamic Principles of Winglets," Engineering Science Data Unit, 1998.
[2] J. Johansen and N. S├© rensen, "Aerodynamic investigation of winglets on wind turbine blades using CFD," Ris├©National Laboratory Report Ris├©-R-1543(EN), 2006.
[3] M. Gaunaa and J. Johansen, "Determination of the maximum aerodynamic efficiency of wind turbine rotors with winglets," Journal of Physics: Conference Series, vol. 75, p. 012006, 2007.
[4] Wikipedia, "http://en.wikipedia.org/wiki/File:Airplane vortex edit.jpg," accessed on May 2013.
[5] M. Raciti Castelli, G. Ardizzon, L. Battisti, E. Benini, and G. Pavesi, "Modeling Strategy and Numerical Validation for a Darrieus Vertical Axis Micro-Wind Turbine," Proceedings of the ASME 2010 International Mechanical Engineering Congress & Exposition IMECE2010-39548, 2010.
[6] M. Raciti Castelli and E. Benini, "Effect of blade inclination angle on a Darrieus wind turbine," Journal of Turbomachinery, vol. 134, pp. 031016-1-10, 2012.
[7] M. Raciti Castelli, A. Dal Monte, M. Quaresimin, and E. Benini, "Numerical evaluation of aerodynamic and inertial contributions to Darrieus wind turbine blade deformation," Renewable Energy, vol. 51, pp. 101-112, 2013.
[8] R. Nangia, M. Palmer, and R. Doe, "Aerodynamic design studies of conventional & unconventional wings with winglets," 24 th AIAA Applied Aerodynamics Conference, 2006.
[9] Fluent Inc., "Fluent Users Manual," pp. 52, 54, 59, 71, 143.