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Forces on a marine current turbine during runaway
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.
2017 (English)In: International Journal of Marine Energy, ISSN 2214-1669, Vol. 19, 345-356 p.Article in journal (Refereed) Published
Abstract [en]

A runaway marine current turbine will typically overshoot the runaway speed significantly before it settles at that speed. Numerical simulations of an experimental turbine indicate that the peak forces experienced by the turbine during runaway are up to 2.7 times those seen during nominal operation, and 2.1 times those at asymptotic runaway speed, making peak runaway force an important consideration in turbine design. The main contribution to the force increase is found to originate from the increased rotational speed, but a significant part is also due to the temporal lag in turbine wake development. A parameter study further shows that turbines with low inertia, turbines that have low losses, and turbines designed for low tip speed ratios will experience larger increases in forces.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 19, 345-356 p.
Keyword [en]
Marine current turbineHydrokinetic turbineHydrodynamic ForcesRunawayVortex methods
National Category
Energy Engineering Fluid Mechanics and Acoustics Marine Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-331367DOI: 10.1016/j.ijome.2017.09.007OAI: oai:DiVA.org:uu-331367DiVA: diva2:1149099
Available from: 2017-10-13 Created: 2017-10-13 Last updated: 2017-10-17

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S2214166917300796

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