Effect of Width and Height Ratio of Additional Savonius Blades on Darrieus' Vertical Axis Wind Turbine on Self-Ability Starting and Number of Turbine Revolutions

Abstract

The disadvantage of the Darrieus Troposkein Vertical Axis Wind Turbine (VAWT) is that it is not self-powered starting at low wind speed. Another type of VAWT capable of self-starting at low wind speed is the Savonius type. This research discusses the influence of the width and height ratio of Savonius blades in addition to the VAWT Darrieus troponin rotor on the self-starting capability and number of turbine rotations. The method used is an experiment with additional Savonius blade design variations in the width ratio and rotor heights of 0.718, 0.738 and 0.758. Each has the same swept cross-sectional area of 0.04 m², which is installed under the VAWT Darrieus symmetric troponin rotor, which has an area of the swept cross-section of 0.04 m² and tested at a wind speed of 2 m/s to obtain a time response self-starting and several turbine rotations. Test data was analysed to determine the effect of variations in width ratio, and the height of the Savonius blade additionally affects the self-starting capability and number of turbine rotations. The resulting ratio between the width and height of the Savonius blade is also 0.738, which can increase the self's capability better, starting at 0.758 and 0.718. The ratio between the width and height of the additional Savonius blade 0.758 can produce more turbine rotations than 0.718 and 0.738.