Simulação computacional de escoamentos bidimensionais sobre turbinas eólicas de eixo vertical
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2018-08-31
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Universidade Federal de Goiás
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The Brazilian energy matrix is highly focused on hydroelectric plants, that have been affected by
lack of rain and long drought periods. It’s necessary to invest on alternative kinds of energy. The
wind energy is an option, since Brazil presents winds with suitable velocity for energy generation,
less than 5% of the Brazilian energy power grid is composed by wind turbines. The present work
aims to contribute to the alternative energy generation industry, having as objective the study and
analysis of flow condition over airfoils of vertical axis wind turbines. The simulation of flow over
airfoils were performed using the Pseudo-Spectral Fourier method together with the Immersed
Boundary method for discretization of the spatial domain, and the Runge-Kutta method of fourth
order for discretization of the time domain. Both instantaneous and mean values were recorded for
the lift (Cl) and drag coefficient (Cd), as well as the fields of vorticity, pressure and velocity for the
flow over the airfoils with distinctive characteristics of form and angle of attack. It is concluded
that with this first experiment, by refining the mesh, the values for Cl and Cd get close to the
references. Posteriorly, it was imposed the movement of rotation of one vertical axis wind turbine,
and simulated the flow over this turbine blades, when it was recorded both the instantaneous and
mean values of the lift, drag and power coefficient, as well as the fields of vorticity, pressure and
velocity for different values of velocities of turbine rotation for the airfoils NACA 0008 and
NACA 4308. It was possible to conclude by analyzing the values of power coefficient (Cp), Cl and
Cd obtained through simulation with the turbines that the airfoil NACA 0008 can be utilized for
energy generation, since the airfoil NACA 4308 cannot be utilized in the adopted speed ranges.
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FARIA, G. S. Simulação computacional de escoamentos bidimensionais sobre turbinas eólicas de eixo vertical. 2018. 89 f. Dissertação (Mestrado Engenharia Ambiental e Sanitária) - Universidade Federal de Goiás, Goiânia, 2018.