Surrogate modelling for high-lift multi-element hydrofoil shape optimization of a hydrokinetic turbine blade
Artículo de revista
2020
Elsevier BV
The hydrodynamic shape of a blade is one of the most
important factors in the design process of a horizontal axis
hydrokinetic turbine that influences its performance. The
present work is focused on the design and hydrodynamic
analysis of a high-lift system using the optimization method of
surrogate models and computational fluid dynamics (CFD)
analysis.
The parameters that affect the amount of the lift and the drag
force that a hydrofoil can generate are the gap, the overlap, the
flap deflection angle (δ), the flap chord length (C2) and the
angle of attack of the hydrofoil (α). These factors were varied to
examine the turbine performance in terms of the ratio between
the lift (CL) and the drag coefficient (CD), and the minimum
negative pressure coefficient (min Cpre) in order to avoid the
cavitation inception. For this propose, surrogate models were
implemented to analyse the CFD results and find the optimal
combination of the design parameters of the high-lift hydrofoil.
The traditional Eppler 420 hydrofoil was utilized for the design
of the multi-element profile, which was composed of a main
element and a flap. The multi-element design selected as
optimal had a gap of 2.825 %C1, an overlap of 8.52 %C1, a δ of
19.765˚, a C2 of 42.471 %C1 and a α of -4˚, where C1 refers to
the chord length of the main element. In comparison with the
traditional Eppler 420 hydrofoil, CL/CD ratio increases from
39.050 to 42.517.
Key words. Horizontal axis hydrokinetic turbine, surrogate
model, computational fluid dynamics, high-lift system, multielement hydrofoil
- Eventos [4]
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Surrogate modelling for high-lift multi-element hydrofoil shape optimization of a hydrokinetic turbine blade.pdf
Título: Surrogate modelling for high-lift multi-element hydrofoil shape optimization of a hydrokinetic turbine blade.pdf
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Título: Surrogate modelling for high-lift multi-element hydrofoil shape optimization of a hydrokinetic turbine blade.pdf
Tamaño: 1.305Mb
PDFLEER EN FLIP