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Influence of incoming flow direction on spacing between vertical axis marine current turbines placed in a row
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.
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.
2012 (English)In: Proceedings of the ASME 31th International Conference on Ocean, Offshore and Artic Engineering, vol. 7, 2012, 285-291 p.Conference paper, Published paper (Refereed)
Abstract [en]

From the commercial point of view it may be beneficial to installa set of marine current turbines forming a park, by analogy with windparks. Consequently, this motivates research on park configurations.An array of ten vertical axis marine current turbines is simulatedto study how the distance between the turbines affects the performanceof the park for different flow directions. The simulations are performedusing a two-dimensional vortex method. An array of identical turbinesis created, where all turbines are on a single line. The turbinesare operated at the tip speed ratio, which corresponds to the highestpower coefficient for a single turbine. The distance between the turbinesis varied and the total power from the array is compared to the turbinespacing for different flow directions.Additionally, flow data from a real site is used to find an optimalorientation of the line of turbines. The performance of the arrayis estimated for the site as a function of turbine spacing.

Place, publisher, year, edition, pages
2012. 285-291 p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-183733DOI: 10.1115/OMAE2012-83347ISI: 000324507000035ISBN: 978-0-7918-4494-6 (print)OAI: oai:DiVA.org:uu-183733DiVA: diva2:563993
Conference
31st ASME International Conference on Ocean, Offshore and Arctic Engineering, Jul 01-06, 2012, Rio de Janeiro, Brazil
Funder
StandUpStandUp for Wind
Available from: 2012-11-01 Created: 2012-11-01 Last updated: 2017-11-28
In thesis
1. Fluid Mechanics of Vertical Axis Turbines: Simulations and Model Development
Open this publication in new window or tab >>Fluid Mechanics of Vertical Axis Turbines: Simulations and Model Development
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Two computationally fast fluid mechanical models for vertical axis turbines are the streamtube and the vortex model. The streamtube model is the fastest, allowing three-dimensional modeling of the turbine, but lacks a proper time-dependent description of the flow through the turbine. The vortex model used is two-dimensional, but gives a more complete time-dependent description of the flow. Effects of a velocity profile and the inclusion of struts have been investigated with the streamtube model. Simulations with an inhomogeneous velocity profile predict that the power coefficient of a vertical axis turbine is relatively insensitive to the velocity profile. For the struts, structural mechanic loads have been computed and the calculations show that if turbines are designed for high flow velocities, additional struts are required, reducing the efficiency for lower flow velocities.Turbines in channels and turbine arrays have been studied with the vortex model. The channel study shows that smaller channels give higher power coefficients and convergence is obtained in fewer time steps. Simulations on a turbine array were performed on five turbines in a row and in a zigzag configuration, where better performance is predicted for the row configuration. The row configuration was extended to ten turbines and it has been shown that the turbine spacing needs to be increased if the misalignment in flow direction is large.A control system for the turbine with only the rotational velocity as input has been studied using the vortex model coupled with an electrical model. According to simulations, this system can obtain power coefficients close to the theoretical peak values. This control system study has been extended to a turbine farm. Individual control of each turbine has been compared to a less costly control system where all turbines are connected to a mutual DC bus through passive rectifiers. The individual control performs best for aerodynamically independent turbines, but for aerodynamically coupled turbines, the results show that a mutual DC bus can be a viable option.Finally, an implementation of the fast multipole method has been made on a graphics processing unit (GPU) and the performance gain from this platform is demonstrated.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 111 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 998
Keyword
Wind power, Marine current power, Vertical axis turbine, Wind farm, Channel flow, Simulations, Vortex model, Streamtube model, Control system, Graphics processing unit, CUDA, Fast multipole method
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-183794 (URN)978-91-554-8539-9 (ISBN)
Public defence
2012-12-14, Polhemssalen, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2012-11-22 Created: 2012-11-01 Last updated: 2013-02-11

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Dyachuk, EduardGoude, AndersLalander, EmiliaBernhoff, Hans

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