Abstract
Abstract Indonesia has the abundant potential of hydropower but not yet processed optimally, which intensely depends on fossil fuel. Hydropower installed in Indonesia is only 11,272 MW, from the estimated potential approximately 94,476 MW. This data shows that 89% of the hydropower potential in Indonesia has not been processed. One of the present efforts to utilize this resource is addressed to develop the Savonius water turbine. Conventional water Savonius turbines have a comprehensible structure and easy to be applied. However, the turbines produce relatively small power, which requires further assessment to improve its performance. The current study is performed by considering geometric changes on the water Savonius turbine to observe their effect on power characteristics. Considered changes are made on the number of stages, and the angle between stages, specifically a single-stage, two-stage 0°, Two-stage 90°, three-stage 0°, and three Stage 120°. The research was carried out by designing simulation model using ANSYS software with CFX Solver. Water speed is determined to 0.8 m/s, while plates with 110 mm in diameter and 110 mm in height are incorporated as rotor configuration. Based on this study, it can be concluded that the addition of the stage affected improving the performance of the Savonius water turbine, where the multi-stage turbine experienced an increment compared to conventional water turbines. The interesting tendency was found on the two-stage rotors with angle of 0° which produced a smaller Cpmax compared to the conventional water Savonius turbines.
Highlights
An average increase in electrical energy consumption by 4.7% and production by 11.8% in the last three years in Indonesia
It can be concluded that the addition of the stage affected improving the performance of the Savonius water turbine, where the multi-stage turbine experienced an increment compared to conventional water turbines
The interesting tendency was found on the two-stage rotors with angle of 0∘ which produced a smaller coefficient of power maximum (Cpmax) compared to the conventional water Savonius turbines
Summary
An average increase in electrical energy consumption by 4.7% and production by 11.8% in the last three years in Indonesia. The energy source has decreased every year. This work is licensed under the Creative Commons other energy source that has great potential in Indonesia is Hydropower. The development of a water turbine is one of the efforts to process water energy into electricity. Research on hydro turbines has been carried out such as screw-type at small hydropower plants [3]. In the 1920s, Savonius published the results of carried out tests on his rotor design. They are operating in both wind and water. In the case of water, the test was carried out in the river flow, tidal waters and sea waves [4]
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