ed-Dı̂n Fertahi, S. and Bouhal, T. and Rajad, O. and Kousksou, T. and Arid, A. and El Rhafiki, T. and Jamil, A. and Benbassou, A. (2018) CFD performance enhancement of a low cut-in speed current Vertical Tidal Turbine through the nested hybridization of Savonius and Darrieus. Energy Conversion and Management, 169. pp. 266-278.

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Abstract

This paper aims to enhance through two-dimensional numerical CFD simulations the hydrodynamic performance of a low cut-in speed current Vertical Axis Tidal Turbine (VATT) by means of the nested hybridization of Savonius and Darrieus. In fact, the hybrid turbine offers several coupling scenarios. In this work, the nested coupling has been used for Darrieus and Savonius to design the hybrid turbine model. Moreover, the effect of the rotational velocities of Savonius and Darrieus turbines, weather synchronized/desynchronized, identical/inverse rotational direction of the assessed rotors has been investigated. OpenFoam code was used to evaluate the hydrodynamic performance of the nested hybrid turbines, and to investigate their torque and power coefficients. This code is based on an Unsteady Reynolds Averaged Navier Stocks (URANS) approach coupled with k-ω Shear Stress Transport (SST) turbulence model. URANS models were validated against the literature results by performing 2D simulations on Savonius and Darrieus wind turbines. Therefore, the turbine's behavior was studied and the overall performance efficiency of the nested hybrid design was enhanced over a defined Tip Speed Ratio (TSR) range. The main founding of this study was that the hybrid asynchronous coupling of Savonius and Darrieus (Identical rotational direction for the two rotors) is providing the effective performances compared to the other hybrid studied configurations. © 2018 Elsevier Ltd

Item Type: Article
Uncontrolled Keywords: Codes (symbols); Hydrodynamics; Shear stress; Turbulence models; Wind turbines, Darrieus; Nested hybridization; OpenFOAM; Performance enhancements; Savonius; Vertical axis tidal turbines, Computational fluid dynamics
Subjects: Energy
Divisions: SCIENTIFIC PRODUCTION > Energy
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47
URI: http://eprints.umi.ac.ma/id/eprint/3024

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