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Analytical solutions for a single blade in vertical axis turbine motion in two dimensions
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Numerical Analysis.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2009 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 28, 506-520 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2009. Vol. 28, 506-520 p.
National Category
Computational Mathematics Energy Engineering
Identifiers
URN: urn:nbn:se:uu:diva-88420DOI: 10.1016/j.euromechflu.2008.11.004ISI: 000267179900004OAI: oai:DiVA.org:uu-88420DiVA: diva2:158307
Available from: 2009-02-01 Created: 2009-02-01 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Analytical Aerodynamic Simulation Tools for Vertical Axis Wind Turbines
Open this publication in new window or tab >>Analytical Aerodynamic Simulation Tools for Vertical Axis Wind Turbines
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wind power is a renewable energy source that is today the fastest growing solution to reduce CO2 emissions in the electric energy mix. Upwind horizontal axis wind turbine with three blades has been the preferred technical choice for more than two decades. This horizontal axis concept is today widely leading the market. The current PhD thesis will cover an alternative type of wind turbine with straight blades and rotating along the vertical axis. A brief overview of the main differences between the horizontal and vertical axis concept has been made. However the main focus of this thesis is the aerodynamics of the wind turbine blades.

Making aerodynamically efficient turbines starts with efficient blades. Making efficient blades requires a good understanding of the physical phenomena and effective simulations tools to model them. The specific aerodynamics for straight bladed vertical axis turbine flow are reviewed together with the standard aerodynamic simulations tools that have been used in the past by blade and rotor designer. A reasonably fast (regarding computer power) and accurate (regarding comparison with experimental results) simulation method was still lacking in the field prior to the current work. This thesis aims at designing such a method.

Analytical methods can be used to model complex flow if the geometry is simple. Therefore, a conformal mapping method is derived to transform any set of section into a set of standard circles. Then analytical procedures are generalized to simulate moving multibody sections in the complex vertical flows and forces experienced by the blades. Finally the fast semi analytical aerodynamic algorithm boosted by fast multipole methods to handle high number of vortices is coupled with a simple structural model of the rotor to investigate potential aeroelastic instabilities.

Together with these advanced simulation tools, a standard double multiple streamtube model has been developed and used to design several straight bladed rotor ranging from 2 kW to 20 kW.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 100 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 774
Keyword
vertical axis turbine, vortex flows, conformal mapping, analytical aerodynamics, potential flows, fast multipole methods
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-132073 (URN)978-91-554-7913-8 (ISBN)
Public defence
2010-11-26, Häggsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Note
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 704Available from: 2010-11-04 Created: 2010-10-14 Last updated: 2011-03-22Bibliographically approved

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Deglaire, PaulEngblom, StefanÅgren, OlovBernhoff, Hans

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