Performance Analysis on a New Design of Blade Shape for Savonius Wind Turbine
DOI:
https://doi.org/10.37934/arfmts.108.1.173183Keywords:
M Power coefficient, renewable energy, Savonius wind turbine, vertical axis, wind energyAbstract
Drag-type vertical axis wind turbine (VAWT) is well known as a potential and reliable in the development of a wind energy system. Its advantages attract world attention due to its simple geometry design and significantly cheaper to build compared to a horizontal axis wind turbine (HAWT). The present study will consider the essential geometry improvement of the Savonius rotor, where the profile of the blade was made in the form of a half-cylinder. Numerical simulation was conducted to study the effect of geometrical setup on the performance of the rotor in terms of the coefficient of power, coefficient of torque and power output. The model was designed according to the existing tested model by experimental work, except for the inner surface blade which uses an overlap ratio of 0.2. Different wind speeds of 6 m/s, 8 m/s and 10 m/s were used for the simulation to analyze the behaviour of properties of the new design blade. According to the results obtained, it shows that the power coefficient for the new design of the inner blade was increased by 20% compared to the previous design. The power output of the wind turbine reaches the maximum power in the middle of the tip speed ratio for all types of wind speeds. This is because the power coefficient will start to fall off after reaching the maximum electrical power produced. Besides, it is due to the limit of the blade performance which will keep the blade from rotating too fast and avoiding damage due to excessive force.