Analysis of the effect of a series of back twist blade configurations for an active pitch-to-stall floating offshore wind turbine

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dc.contributor.authorWard, Dawn
dc.contributor.authorCollu, Maurizio
dc.contributor.authorSumner, Joy
dc.date.accessioned2020-08-21T08:36:19Z
dc.date.available2020-08-21T08:36:19Z
dc.date.issued2020-04-08
dc.description.abstractFor a turbine mounted on a floating platform, extreme induced loads can be increased by up to 1.6 times those experienced by a turbine situated on a fixed base. If these loads cannot be reduced, towers must be strengthened which will result in increased costs and weight. These tower loads would be additionally exasperated for a pitch-to-feather controlled turbine by a phenomenon generally referred to as “negative damping,” if it were not avoided. Preventing negative damping from occurring on a pitch-to-feather controlled floating platform negatively affects rotor speed control and regulated power performance. However, minimizing the blade bending moment response can result in a reduction in the tower fore-aft moment response, which can increase the tower life. A variable-speed, variable pitch-to-stall (VSVP-S) floating semi-submersible wind turbine, which does not suffer from the negative damping and hence provides a more regulated power output, is presented. This incorporates a back twist blade profile such that the blade twist, starting at the root, initially twists toward stall and, at some pre-determined “initiation” point, changes direction to twist back toward feather until the tip. Wind frequency weighting was applied to the tower axial fatigue life trends of different blade profiles and a preferred blade back twist profile was identified. This had a back twist angle of −3 deg and started at 87.5% along the blade length and achieved a 5.1% increase in the tower fatigue life.en_UK
dc.identifier.citationWard D, Collu M, Sumner J. (2020) Analysis of the effect of a series of back twist blade configurations for an active pitch-to-stall floating offshore wind turbine. Journal of Offshore Mechanics and Arctic Engineering, Volume 142, Issue 6, December 2020, Article number 062001en_UK
dc.identifier.issn0892-7219
dc.identifier.urihttps://doi.org/10.1115/1.4046567
dc.identifier.urihttps://asmedigitalcollection.asme.org/offshoremechanics/article/142/6/062001/1075669/Analysis-of-the-Effect-of-a-Series-of-Back-Twist
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/15710
dc.language.isoenen_UK
dc.publisherAmerican Society of Mechanical Engineersen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectfloating offshore wind turbine (FOWT)en_UK
dc.subjectpitch-to-stallen_UK
dc.subjectblade back twisten_UK
dc.subjecttower axial fatigue lifeen_UK
dc.subjectdesign of offshore structuresen_UK
dc.subjectdynamics of structuresen_UK
dc.subjectfloating and moored production systemsen_UK
dc.subjectocean energy technologyen_UK
dc.subjectstructural mechanics and foundationen_UK
dc.titleAnalysis of the effect of a series of back twist blade configurations for an active pitch-to-stall floating offshore wind turbineen_UK
dc.typeArticleen_UK

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