Abstract
This paper describes the influence of the number of rotor blades the performance of the orthopter wind turbine. The orthopter wind turbine is combination between a drag-type and a lift-type vertical axis wind turbine which each blade combines a rotating movement around its own axis and a rotating movement around turbine's axis. In this case, the pitch of the blades was controlled by using a chain and sprockets arrangement to ensure that the blades rotated around their own axis by 360 degrees during the each two full revolution of the main rotor. To improve the performance of this wind turbine, the number of blades, was investigated by wind tunnel. By conducting two-dimensional unsteady CFD simulations, the power and torque of the vertical axis wind turbine and the flow around blades were also analyzed. The numerical simulation by using turbulence model predicted good agreement of the performance with experiment qualitatively.
Highlights
Wind energy is one of renewable energy resources which plays an important role in response to shortage of fossil fuels and climate change [1]
The vertical axis wind turbine can be classified into two groups according to the method of power generation
The different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters and it was found that, the two blades rotor is more efficient than three and four ones [7].The vertical axis wind turbine lift- base power has wide range angle of attack (AoA) in one cycle experiences [8]
Summary
Wind energy is one of renewable energy resources which plays an important role in response to shortage of fossil fuels and climate change [1]. The vertical axis wind turbine can be classified into two groups according to the method of power generation. The first group is called lift-based power generation such as; Darrieus wind turbine and its variants. The second group is called drag-based power generation such as; Savonius wind turbine and its variants. The concept of the orthopter wind turbine is combination of both lift and drag-based power generation. The different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters and it was found that, the two blades rotor is more efficient than three and four ones [7].The vertical axis wind turbine lift- base power has wide range angle of attack (AoA) in one cycle experiences [8]. The angle of attack of blade rotor beyond the stall of AoA and reduce positive torque generation. The purpose of the author’s is to investigate of the effects of number of blade and tip speed ratio corresponding to performances by experiments and numerical study
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