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A numerical approach for estimating the aerodynamic characteristics of a two bladed vertical Darrieus wind turbine

Abstract : This paper presents the results of a numerical investigation on the turbulent flow on a 2D Darrieus turbine. This flow is particularly complex for two reasons: as the turbines rotates, the incidence angle and the blade's Reynolds number changes, involving strong unsteady effects in the flow field. The most important of them consists in a continuous dynamic separation of the flow, which influences the performance of the turbine. The numerical model used to describe the flow is an explicit RANS K-omega code (academic Turbflow™ software). The use of a block-structured mesh allows high order numerical schemes involving low numerical dissipation. The final objective of this work is to model precisely the flow on the two-NACA airfoils Darrieus turbine studied experimentally by Laneville and Vittecoq [4]. In particular, an improvement of the dynamic stall modeling, compared with a previous numerical study [Ploesteanu and Maitre, 2003], [2] is expected. Firstly, the paper presents the main features of the flow in a Darrieus turbine. Secondly it focus on the dynamic stall phenomenon and presents the main results obtained in the aformentionned previous study. Finally the first results obtained with the present approach are commented. Because the rotating test cases are at present in progress, this paper presents partial results for non rotating configurations corresponding to three angular positions of the turbine. These configurations allow to discuss the starting capability of the Darrieus turbine and highlight the promising ability of the modeling to take into account large stalled region.
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  • HAL Id : hal-00232721, version 1

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Ervin Amet, Christian Pellone, Thierry Maître. A numerical approach for estimating the aerodynamic characteristics of a two bladed vertical Darrieus wind turbine. 2nd Workshop on Vortex dominated flows, Jul 2006, Bucarest, Romania. ⟨hal-00232721⟩

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