Analysis of a lift augmented hydrofoil for hydrokinetic turbines
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Chica Arrieta, Edwin Lenin | 2019
In the last years, increased attention has been
given to hydrokinetic energy technologies due to these turbines
represent an attractive technology for the harnessing of a huge
untapped renewable energy potential in oceans, seas but also in
rivers and canals. However, the low efficiency is an important
barrier to its commercialization. The aim of this study is to
present the selection of a multi-element hydrofoil that can
enhance the hydrokinetic turbine performance. Therefore, in
order to examine the influence of the type of airfoil used, as
multi-element hydrofoil, on the blade performance, several
studies using JavaFoil software were performed. The result
indicates that hydrofoil multi-element Eppler 420 can provide
high efficiency of the turbine because it has a higher
relationship between the lift and drag coefficients CLmax /CD
(47.77) compared to the Selig S1223 profile (39.59) and other
hydrofoils studied. Furthermore, computational fluid dynamics
(CFD) was used to obtain the hydrodynamic characteristics of
the hydrofoil Eppler 420 with and without flap. The CFD
simulations were carried out using ANSYs-Fluent software. It
was observed that there is an increase in the lift coefficient by
69.46% and 471.39 % for the hydrofoil with flap and a chord
length of 30%, and a chord length of 70%, respectively, under
the analyzed conditions with respect to the hydrofoil without
flap.
Keywords: multi-element blade, hydrokinetic turbine,
hydrodynamic analysis, chord length, JavaFoil, 2D simulation
LEER