ANÁLISE DO POTENCIAL MECÂNICO E TORQUE AERODINÂMICA COM DADOS DE TEMPERATURA DO VENTO EM TURBINAS EÓLICAS DE EIXO HORIZONTAL

Abstract

In Brazil, a large part of its energy matrix comes from water and thermal sources, being one of the countries that generates the most clean energy on the planet. In addition to these forms of energy generation and production, we have biogas, photovoltaics and wind energy from solar sources, all of which are in the process of growing, but slowly being used, although extremely favorable, especially in the northeast region of the country. In wind energy, the study for the modeling of turbine blades addresses a series of variables that have a profound impact on the extraction of wind energy, including the power coefficient Cp, which expresses structural and operating characteristics of the rotor, as well as factors atmospheric atmospheres of the turbine. Although the local temperature is not explicit in Cp, it impacts on the mechanical energy extracted from the wind, which can affect the final production of electrical energy. In this article, the performance of the wind turbine rotor is evaluated as a function of the torque coefficient C_Q, which is related to the power coefficient Pm through the speed ratio of the blade tip λ, which in turn is a ratio between rotor speed and of the wind. We analyzed the torque coefficient using λ, the pitch angle β and Pm at different temperatures, recognizing the relationship between T_A aerodynamic torque and C_Q. The analysis indicates that controlling the angular speed consequently means that the aerodynamic torque T_A caused by the blades will be controlled, therefore the extracted Pm, T_A and λ are related. The purpose of this study is to recognize previously the oscillations of wind and temperature changes, with the possibilities that the systems after the turbine optimize the control of angular speed of the rotor, minimizing the oscillations delivered to the electric generator.