Our world has been relying on fossil fuel, a non-renewable energy that is depleting day by day and negatively impacting the environment. Hydropower is known to contribute a significant portion of the renewable power production. Dams has been the most common technique to generate hydropower. However, such scheme was not able to support the rural areas as it requires large areas and huge amount of water resource. Savonius hydrokinetic turbine (HKT) has been suggested as the device for a small-scale application as it can generate power from low-velocity river flow with less installation cost. With that, the aim of this study is designed to investigate and compare performance of the single-staged and two-staged HKT for river flow. This study considered numerical simulation that includes modelling, testing, and analyzing the data. Then, comparing it with the existing literature results, to identify the solution. This investigation demonstrates an improvement of 8.1% in the efficiency of power coefficient when compared with single-staged HKT.
Several different designs and prototypes of ocean current turbines have been tested over recent years. For every design test, emphasis is given to achieving an optimum power output from the flow. In this study, the performance of a Horizontal Axis Ocean Current Turbine (HAOCT) has been investigated using three-dimensional Computational Fluid Dynamics (CFD) simulations for three cases, namely, (1) a turbine without a deflector, (2) a turbine with a deflector, and (3) a turbine with a deflector operating at a higher fluid depth. The turbine design was modeled in DesignModeler software and simulations were carried out in commercial CFD software Flow-3D. The Torque Coefficient (Cm) and Power Coefficient (Cp) for the turbine have been investigated for a certain range of Tip-Speed Ratios (TSRs) in a flow velocity of 0.7 m/s. Furthermore, comparisons have been made to demonstrate the effect of the deflector on the performance of the turbine and the influence of a higher fluid pressure on the same. The results from the simulations indicate that the higher value of Cp was achieved for Case 2 as compared to the other two cases. The findings from the study indicate that the use of the deflector enhances the performance of the turbine. Furthermore, a higher fluid pressure acting on the turbine has a significant effect on its performance.
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