Dimensionamento de um rotor de uma turbina eólica de eixo vertical de pás retas de pequeno porte

Abstract

The demand for energy is exponential and is accompanied by a great socio-environmental concern related to the impact of the emission of gases from non-renewable sources of electricity on the global climate, and wind energy is one of the alternatives to meet demands that do not emit gases. The present study aims to design a 1kW vertical axis straight blade wind turbine rotor using the Double Multiple streamtubes model. The analysis is carried out, firstly analyzing the suitable solidity range for the rotor, using mean values between 0.20 and 0.25 for solidity, then it is verified for rotor combinations with solidities between the optimal range, the influence of number of blades for torque amplitude, with the greater the number of blades, the smaller the torque variation, and therefore only the combinations with the three blades are selected, finally, the final two candidates named and rotors are compared, noting that the rotor β has a large negative zone of performance coefficient, impacting the rotor's starting capacity, and therefore being discarded. The final rotor chosen is the γ with NACA 0021, as this rotor has the smallest negative zone for the performance.