Flow control for the vertical axis wind turbine by means of flapping flexible foils

Abstract

An active flow control mechanism is proposed to improve the efficiency of the energy extraction for the vertical axis wind turbine. The proposed system consists of a vertical axis wind turbine with flexible blades. The conception is inspired from the vortex control mechanism utilized by the aero-/aqua animals to improve their performance via the flexion of their fins. The viscous non-stationary flow around the turbine is simulated using the ANSYS-FLUENT 15 software. The complex flapping motion is reproduced using a dynamic mesh technique and a user-defined function. The results show that, with this strategy of control, the turbine generates a higher moment coefficient due to the increase in the peaks of lift force caused by a better difference in the pressure between the two sides of the blade due to the flexure motion. The turbine power coefficient can reach 38 % enhancement for the optimal flow control conditions.

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Abbreviations

A :

Rotor swept area

a 0 :

Oscillating amplitude (m)

C :

Blade chord (m)

C L :

Lift coefficient

\(C_{\text{D}}\) :

Drag coefficient

\(C_{\text{m}}\) :

Moment coefficient

\({\text{CP}}\) :

Power coefficient

\(C_{\text{p}}\) :

Pressure coefficient

\(D\) :

Turbine diameter (m)

\(f\) :

Oscillating frequency (Hz)

\(h(x)\) :

Instantaneous airfoil position along the x axis

\(h(y)\) :

Instantaneous airfoil position along the y axis

t :

Instant time (s)

T :

Turbine revolution

\(L\) :

Lift force (N)

\(M\) :

Moment (N m)

\(P\) :

Power (W)

\(R\) :

Turbine radius (m)

\(U\) :

Incoming flow velocity (m/s)

LEV:

Leading edge vortex

\({\text{zi}}\) :

Flapping frequency controlled parameter relative to turbine radius

η :

Efficiency

μ :

Dynamic viscosity

ρ :

Density

λ :

Tip speed ratio

θ :

Turbine azimuthal angle (°)

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Correspondence to Mohamed Taher Bouzaher.

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Technical Editor: Jose A. dos Reis Parise.

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Bouzaher, M.T., Hadid, M. & Semch-Eddine, D. Flow control for the vertical axis wind turbine by means of flapping flexible foils. J Braz. Soc. Mech. Sci. Eng. 39, 457–470 (2017). https://doi.org/10.1007/s40430-016-0618-3

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Keywords

  • Control mechanism
  • Vertical axis wind turbine
  • Stall
  • Flexible foils
  • Energy harnessing
  • Efficiency