Distortion effects on turbulence in a tidal flow due to the mean flow field of a horizontal axis tidal turbine

J. Michael R. Graham, Ian Angus Milne

Research output: Chapter in Book/Conference paperConference paper

Abstract

An application of Rapid Distortion of Turbulence (RDT) Theory to turbulence incident on a Horizontal Axis Tidal Turbine rotor is presented. Results are presented using two approaches, one for the case when the turbulence length scale is assumed to be small compared to the rotor diameter and, another when it is comparable or larger than it and which uses a wavenumber method. It is shown that distortion by the mean flow field of the rotor can lead to appreciable intensification of the streamwise turbulent velocity to which the unsteady blade
loading and therefore fatigue is sensitive. Results of some of the analysis of the experimental turbulence data obtained from the tidal stream through the Sound of Islay are also presented to provide an assessment of typical intensities, spectra and lengthscales of the turbulence in this channel in order to estimate the magnitude of the turbulence distortion effect for a typical size of
turbine and operating condition.
Original languageEnglish
Title of host publicationProceedings of the 12th European Wave and Tidal Energy Conference (ETWEC2017)
Pages693-1-693-6
Publication statusPublished - 2018
Event12th European Wave and Tidal Energy Conference - Cork, Ireland, United Kingdom
Duration: 27 Aug 20171 Sep 2017
http://www.ewtec.org/ewtec-2017/

Conference

Conference12th European Wave and Tidal Energy Conference
CountryUnited Kingdom
CityCork, Ireland
Period27/08/171/09/17
Internet address

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