Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-10T21:07:59Z No. of bitstreams: 1 LuizGuilhermeVieiraMeiraDeSouza_DISSERT.pdf: 5289218 bytes, checksum: c88882ed7873a6e13af70d302f562b90 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-12T23:55:24Z (GMT) No. of bitstreams: 1 LuizGuilhermeVieiraMeiraDeSouza_DISSERT.pdf: 5289218 bytes, checksum: c88882ed7873a6e13af70d302f562b90 (MD5) / Made available in DSpace on 2016-05-12T23:55:24Z (GMT). No. of bitstreams: 1 LuizGuilhermeVieiraMeiraDeSouza_DISSERT.pdf: 5289218 bytes, checksum: c88882ed7873a6e13af70d302f562b90 (MD5) Previous issue date: 2015-04-23 / ? apresentado o estudo num?rico de um sistema e?lico de convers?o de energia, que consiste de um aerogerador de eixo horizontal instalado no interior de uma envolta difusora com um flange na periferia de sua sa?da, utilizando CFD. A envolta difusora flangeada desempenha o papel de coletar e acelerar o vento, assim aumentando a pot?ncia el?trica gerada pelo aerogerador. De modo a obter uma pot?ncia de sa?da ainda maior, dados encontrados na literatura a respeito de par?metros ?timos para a envolta, tais como ?ngulo de abertura, altura do flange, formato da entrada, etc., foram utilizados para gerar o modelo estudado neste trabalho. Os resultados obtidos com as simula??es foram ?teis para avalia??es dos n?meros de Reynolds, coeficientes de pot?ncia e outros par?metros envolvidos no processo. O torque e velocidade angular do aerogerador tamb?m foram determinados. Como resultado, o aerogerador com envolta difusora flangeada demonstrou um aumento de pot?ncia em rela??o ao aerogerador simples. / It is presented a numerical study, using Computational Fluid Dynamics (CFD), of a wind power conversion system that consists of a horizontal axis wind turbine installed inside of a diffuser shroud with a flange at the exit periphery. The flanged diffuser shroud plays the role of a device for collecting and accelerating the approaching wind, thereby increasing the power generated by the turbine. In order to obtain an even higher power output, data found on literature concerning optimal parameters for the diffuser shroud, such as open angle, flange height, hub ratio and inlet shape, were used to generate the model studied in this paper. The obtained results from computational simulations were useful for evaluations of the criteria adopted for the study and velocities and pressure distributions. Furthermore, it was possible to calculate the axis power produced by the rotor and the mean wind velocities in the radial direction in front of the rotating plane of the blades for the bare wind turbine case and for the shrouded wind turbine case, making it possible to conclude that the proposed system provided a power increase for a given rotor diameter and Wind speed by a factor of 3.74 when compared to the bare Wind turbine configuration.