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Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation

Morris, C. E.; Morris, C. E.; O'Doherty, Daphne; O'Doherty, D. M.; O'Doherty, Tim; O'Doherty, T.; Mason-Jones, Allan; Mason-Jones, A.

Authors

C. E. Morris

Ceri Morris Ceri.Morris@uwe.ac.uk
Lecturer in Mechanical Engineering

Daphne O'Doherty

D. M. O'Doherty

Tim O'Doherty

T. O'Doherty

Allan Mason-Jones

A. Mason-Jones



Abstract

© 2015 The Authors. The hydrodynamic forces imparted on a tidal turbine rotor, whilst causing it to rotate and hence generate power, will also cause the blades to deform. This deformation will affect the turbine's performance if not included in the early design phase and could lead to a decrease in power output and a reduction in operational life. Conversely, designing blades to allow them to deform slightly may reduce localised stress and therefore prolong the life of the blades and allow the blades to deform in to their optimum operational state. The aim of this paper is to better understand the kinetic energy extraction by varying the material modulus of a turbine blade. Shaft torque/power, blade tip displacement, and axial thrust results are presented for 2, 3 and 4 bladed rotor configurations at peak power extraction. For the rotor design studied the FSI model data show that there is a low sensitivity to blade deformation for the 2, 3 and 4 bladed rotors. However, the results reveal that the 3 bladed rotor displayed maximum hydrodynamic performance as a rigid structure which then decreased as the blade deformed. The 2 and 4 bladed rotor configurations elucidated a slight increase in hydrodynamic performance with deflection.

Citation

Mason-Jones, A., O'Doherty, T., O'Doherty, D. M., Morris, C. E., Morris, C., O'Doherty, D., …Mason-Jones, A. (2016). Kinetic energy extraction of a tidal stream turbine and its sensitivity to structural stiffness attenuation. Renewable Energy, 88, 30-39. https://doi.org/10.1016/j.renene.2015.10.037

Journal Article Type Article
Acceptance Date Oct 19, 2015
Online Publication Date Nov 19, 2015
Publication Date Apr 1, 2016
Journal Renewable Energy
Print ISSN 0960-1481
Electronic ISSN 1879-0682
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 88
Pages 30-39
DOI https://doi.org/10.1016/j.renene.2015.10.037
Keywords CFD, FEA, tidal stream turbine, FSI, TST
Public URL https://uwe-repository.worktribe.com/output/912942
Publisher URL http://dx.doi.org/10.1016/j.renene.2015.10.037

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