Title: Constructal design applied to geometrical analysis of a triangular arrangement of H-Darrieus wind turbines

Authors: Kauê Louro Martins; Rafael Bruno Da Silva; George Maximiano Silvestre; Vinícius Torres Pinto; Elizaldo Domingues Dos Santos; Liércio André Isoldi; Luiz Alberto Oliveira Rocha

Addresses: Graduate Program in Ocean Engineering (PPGEO), Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' Graduate Program in Ocean Engineering (PPGEO), Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' Graduate Program in Ocean Engineering (PPGEO), Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' Graduate Program in Ocean Engineering (PPGEO), Federal University of Rio Grande (FURG), Itália Ave. km 8, Rio Grande, 96203-900, Brazil ' University of Vale dos Sinos (UNISINOS), Dr. Nilo Peçanha Ave. 1600, Porto Alegre, 91330-002, Brazil

Abstract: The work performs a numerical study of a triangular arrangement of three H-Darrieus wind turbines. There are two constraints: areas of turbines and occupation areas of turbines, and two degrees of freedom: ratio between transversal pitch (ST) of downstream rotors and diameter (D) of turbine and, ratio between longitudinal pitch (SL) of upstream and downstream rotors and diameter of turbine. The purposes are to maximize the power coefficient (Cm) and evaluate the effect of arrangement design on the performance. Three ST/D and eight SL/D are considered. Results showed that ST/D = 2.0 presents a higher interaction between the fluid dynamic boundary layer of the rotors, which implies in an oscillating variation in Cm with variation of the ratio SL/D. The effect of SL/D over Cm have other behaviour for the other ratios of ST/D analysed, variating the optimal ratio for each case, showing that optimal SL/D is dependent of ST/D.

Keywords: H-Darrieus turbines; constructal design; numerical simulation; wind turbines arrangement.

DOI: 10.1504/IJHM.2020.107782

International Journal of Hydromechatronics, 2020 Vol.3 No.2, pp.155 - 166

Received: 28 Oct 2019
Accepted: 12 Feb 2020

Published online: 15 Jun 2020 *

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