Wake measurements from a hydrokinetic river turbine

Guerra, Maricarmen; Thomson, Jim

Abstract

During the boreal summer of 2015, a full-scale hydrokinetic turbine was deployed in the Kvichak River (Alaska), delivering electricity to the village of Igiugig. Here, quantification and analysis of the hydrodynamic modifications in the river caused by the turbine are presented. Field observations are used to produce a unique three-dimensional data set of fluid velocities in the vicinity of the turbine before and after turbine deployment. Three dynamic regions are distinguished in the wake. There is an induction zone just upstream of the turbine, where velocities decrease and turbulence increases. There is a near wake just downstream of the turbine, where the reduced velocities recover slightly and the elevated turbulence decays rapidly. Finally, there is a far wake well beyond the turbine, where reduced velocities are persistent and turbulence remains elevated. The results are used in a coarse energy budget for the river, including quantifying the total energy dissipated by turbulence in the near wake. This wake dissipation is found to be almost as large as the energy extracted for electricity generation, even when the turbine is not operational. (C) 2019 The Authors. Published by Elsevier Ltd.

Más información

Título según WOS: ID WOS:000466249700042 Not found in local WOS DB
Título de la Revista: Renewable Energy
Volumen: 139
Editorial: Else
Fecha de publicación: 2019
Página de inicio: 483
Página final: 495
DOI:

10.1016/j.renene.2019.02.052

Notas: ISI