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dc.contributor.authorMicallef, Daniel
dc.contributor.authorFarrugia, Russell
dc.contributor.authorSant, Tonio
dc.contributor.authorMollicone, Pierluigi
dc.identifier.citationMicallef, D., Farrugia, R., Sant, T., & Mollicone, P. (2014). An aerodynamic study on flexed blades for VAWT applications. 4th Scientific Conference on the Science of Making Torque from Wind, Oldenburg. 1-10.en_GB
dc.description.abstractThere is renewed interest in aerodynamics research of VAWT rotors. Lift type, Darrieus designs sometimes use flexed blades to have an ’egg-beater shape’ with an optimum Troposkien geometry to minimize the structural stress on the blades. While straight bladed VAWTs have been investigated in depth through both measurements and numerical modelling, the aerodynamics of flexed blades has not been researched with the same level of detail. Two major effects may have a substantial impact on blade performance. First, flexing at the equator causes relatively strong trailing vorticity to be released. Secondly, the blade performance at each station along the blade is influenced by self-induced velocities due to bound vorticity. The latter is not present in a straight bladed configuration. The aim of this research is to investigate these effects in relation to an innovative 4kW wind turbine concept being developed in collaboration with industry known as a self-adjusting VAWT (or SATVAWT). The approach used in this study is based on experimental and numerical work. A lifting line free-wake vortex model was developed. Wind tunnel power and hot-wire velocity measurements were performed on a scaled down, 60cm high, three bladed model in a closed wind tunnel. Results show a substantial axial wake induction at the equator resulting in a lower power generation at this position. This induction increases with increasing degree of flexure. The self-induced velocities caused by blade bound vorticity at a particular station was found to be relatively small.en_GB
dc.publisherInstitute of Physics Publishingen_GB
dc.subjectVertical axis wind turbinesen_GB
dc.subjectWakes (Aerodynamics)en_GB
dc.subjectWind tunnelsen_GB
dc.subjectWind turbinesen_GB
dc.titleAn aerodynamic study on flexed blades for VAWT applicationsen_GB
dc.rights.holderThe copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder.en_GB
dc.bibliographicCitation.conferencename4th Scientific Conference on the Science of Making Torque from Winden_GB
dc.bibliographicCitation.conferenceplaceOldenburg, Germany, 9-11/10/2012en_GB
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