A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

The effects of climate change are growing more and evident, this is caused by the increase in CO2 emissions. Fossil fuel exhaustion need for electricity remote areas have encouraged researchers to advance develop renewable energy sector. One type clean technology vertical water turbines that low efficiency. This paper aims design simulate a novel close-ended, guided deflector improve efficiency turbines. research used dynamic mesh technique evaluate concept after was designed, grid independence study, boundary sensitivity timestep study were implemented ensure accuracy results. Then, we sliding model determine performance four rotors. results from showed straight rotor with proposed not suitable operating deflector, static does rotate. However, others valid deflector. For technique, indicated common trend: all rotors’ performances increased when tip speed ratio (TSR) increased, highest amount power coefficient (Cp) found at higher TSRs, such as 1.3 1.4, around 0.45 cross flow type. A three-dimensional simulation conducted similar trend found. Nevertheless, 5% difference between 3D 2D flow. can significantly 0.7 TSR reach over 0.42 Cp TSR, whereas, without reduces approximately 0.1 same TSR.