Abstract
This research aimed to compare the performance of Savonius vertical axis wind turbines through blade numbers and different blade angles. In this study, applicable turbines having 4, 6, 8, 12, 16 and 18 numbers of blades with the angles of the blades of -15°, -5°, 0°, 5° and 15°, respectively. The rotor used was a semicircle shaped blade made from PVC material and has a blade diameter of 6 cm and 30 cm for both rotor diameter and height. The turbine was tested deadweight range of 0-0.49 kg at 4 m/s wind speed. The results showed that the blade angle has a positive effect on increasing the power and torque coefficient of Savonius wind turbine, specifically on blades less than 16. The highest power and torque coefficient was obtained from the turbine having16 blades at an angle of 5°. This configuration also found that the maximum power and torque coefficient in the tip speed ratio ranging from 0.3-0.4 are 0.2519 and 0.5858, respectively.
Highlights
Thailand's integrated energy blueprint is comprised of five plans focusing on energy efficiency, oil, gas, power development, and alternative energy
Vertical axis wind turbines (VAWTs) are suggested as a better choice when compared with wind rotors with a Horizontal axis wind turbines (HAWT) under weak and unstable wind areas
Compare the maximum power coefficient of the optimized blade angle that has been analyzed at different numbers of blades
Summary
Thailand's integrated energy blueprint is comprised of five plans focusing on energy efficiency, oil, gas, power development, and alternative energy. The government of Thailand aims to increase the ratio of renewable energies to 30% of total consumption by 2036. A need to focus on biomass, solar and wind utilization is necessary to generate power and increase the current from 220 MW to 3002 by 2036 (Energy Policy and Planning office [EPPO], n.d.). In Northern Thailand has a wind speed ranging from 2-4 m/ (Thailand Royal Thai Airforce Renewable Energy, n.d.) which is considerably low. Savonius type vertical axis is a wind turbine that can be operated at all wind direction, has low cut-in speed and high torque but has a rather low power performance (Chaichana, 2016)
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