Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
A NEW DIFFUSER TECHNOLOGY APPLIED TO HYDROKINETIC TURBINES
Submission Author:
Luiz Felipe Vaz Ferry , PA
Co-Authors:
Marilza dos santos Viana, Luiz Felipe Vaz Ferry, Jerson Vaz, Pedro Silva, Pedro Elias Barbosa
Presenter: Luiz Felipe Vaz Ferry
doi://10.26678/ABCM.COBEM2019.COB2019-0802
Abstract
Diffuser technology has been strongly studied worldwide, mainly because such a technology is able to improve hydrokinetic turbine performance. Research on diffuser geometry has been made in order to assess the impact of efficiency and thrust of diffuser on turbines. These parameters are important because they are able to change turbine power coefficient, strongly contributing to a better kinetic energy extraction from the flow. Hence, this work concentrates on a novel diffuser geometry, which is able to reach an efficiency of 98%. The new geometry has a double flange, whose objective is to increase the suction region at the diffuser downstream. The flow around the new geometry is simulated through computational fluid dynamics, using κ − ω shear-stress transport turbulence model. An extended Blade Element Momentum approach is used to evaluate turbine performance, in which the effect of efficiency and thrust of the diffuser is employed. The double-diffuser shows relevant changing on the flow velocity and pressure fields, enhancing the turbine performance.
Keywords
Diffuser technology, hydrokinetic turbine, renewable energy
