Assessment of a Diffuser-Augmented Hydrokinetic Turbine Designed for Harnessing the Flow Energy Downstream of Dams

Harnessing the remaining energy downstream of dams has recently gained significant attention as kinetic available in water current is considerable. This work developed a novel study to quantify gain using horizontal-axis hydrokinetic turbine with diffuser. The present assessment uses field data from Tucuruí Dam, where stream velocity 2.35 m/s at which highest extraction can occur. In this case, 3-bladed 10 m diameter, shrouded by flanged conical diffuser, was simulated. Numerical modeling computational fluid dynamics carried out Reynolds averaged Navier–Stokes formulation κ – ω shear stress transport turbulence model. results yield good agreement experimental and theoretical literature. Moreover, power coefficient under diffuser effect could increase about 55% for tip speed ratio 5.4, output increased 1.5 times when compared same without Additionally, there are no turbines installed Amazon region, relevant it explores use an alternative harnessing turbined verted flow dams. may help avoid further environmental impacts caused need structural extensions.