Published June 27, 2013
| Version 8087
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Numerical Analysis of the Influence of Tip Devices on the Power Coefficient of a VAWT
Description
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.
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References
- M. Freestone, "Aerodynamic Principles of Winglets," Engineering Science Data Unit, 1998.
- 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.
- 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.
- Wikipedia, "http://en.wikipedia.org/wiki/File:Airplane vortex edit.jpg," accessed on May 2013.
- 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.
- 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.
- 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.
- R. Nangia, M. Palmer, and R. Doe, "Aerodynamic design studies of conventional & unconventional wings with winglets," 24 th AIAA Applied Aerodynamics Conference, 2006.
- Fluent Inc., "Fluent Users Manual," pp. 52, 54, 59, 71, 143.