The Effect of Velocity Increment by Blockage Factor on Savonius Hydrokinetic Turbine Performance

Hydrokinetic turbines can be used to produce power in inaccessible villages located near rivers. The hydrokinetic turbine uses the kinetic energy of the water and may be put directly in the natural flow of water without dams. For off-grid power production, the Savonius type vertical axis turbine is the easiest to design and manufactured. This proposal uses three-dimensional computational fluid dynamics (CFD) simulations to measure the considerable interaction and complexity of turbine blades.Savonius hydrokinetic turbine (SHKT) performance is affected by blockage in the river, canals, and waterways. Putting a large object in a water channel causes water obstruction and raises local free stream velocity. Blockage correction factor or velocity increment measures the impact of velocity on the performance. SHKT performance is evaluated by comparing power coefficient (Cp) with tip-speed ratio (TSR) at various blockage ratios. The maximum Cp was obtained at TSR of 1.1 with blockage ratio of 45%, whereas TSR 0.8 yielded the highest Cp without blockage. The greatest Cp of 0.29 was obtained with a 45% blockage ratio compared to a Cp max of 0.18 without a blockage. Keyword - Savonius Hydrokinetic Turbine, Blockage Ratio, Vertical Axis Turbine, Power Coefficient.