A Generalized Empirical Model for Velocity Deficit and Turbulent Intensity in Tidal Turbine Wake Accounting for the Effect of Rotor-Diameter-to-Depth Ratio

Author:

Shariff Kabir Bashir1ORCID,Guillou Sylvain S.1ORCID

Affiliation:

1. Ecole d’Ingénieurs (ESIX Normandie), Université de Caen Normandie, UNICAEN, LUSAC, UR 4253, 60 rue Max Pol Fouchet, 50130 Cherbourg-Octeville, France

Abstract

Commercial scale tidal stream turbines (TST) are expected to be deployed in shallow water where the depth varies from 1.5 to 3 turbine diameters. In this study, numerical simulation is conducted at realistic hydrodynamic conditions of potential tidal sites using the stationary actuator disc method at ambient turbulence varying from 5% to 20%, a range of rotor realistic rotor thrust coefficient from 0.64 to 0.98 and a rotor-diameter-to-depth ratio of 20% to 60%. The result shows that the TST wake is affected by the rotor-diameter-to-depth ratio, ambient turbulence, and thrust coefficient. The new empirical model is in accordance with the numerical simulation of a full-scale turbine and is validated with the TST experiment at different rotor-diameter-to-depth ratios with reasonable results in the far wake. This low computational model can benefit the investigation of tidal turbine parks at different configurations where the far wake is pertinent.

Funder

Region Normandie

Communauté d’Agglomération du Cotentin

Publisher

MDPI AG

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