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Numerical simulations of active flow control with synthetic jets in a Darrieus turbine

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  • Velasco, D.
  • López Mejia, O.
  • Laín, S.

Abstract

This study presents two-dimensional numerical simulations of the flow around a cross-flow vertical-axis water turbine (straight-bladed Darrieus type) using active flow control by means of synthetic jets. The performance of the turbine is quantitatively analyzed from the hydrodynamic coefficients (torque coefficient, power coefficient, tangential force coefficient, normal force coefficient, lift coefficient and drag coefficient) and qualitatively by the flow behavior (vorticity field). Numerical simulations of the turbine were carried out using a time-accurate Reynolds-averaged Navier-Stokes (RANS) in ANSYS FLUENT with the shear stress transport k−ω turbulence model. A transient rotor-stator model with a sliding mesh technique was used to capture the changes in the flow field at each time step. Numerical results show that the use of synthetic jets over the extrados and intrados of the airfoil increases the net torque and power output of the turbine. Besides, this increment in the net power generated by the turbine is higher than the power consumed by the synthetic jets. Therefore, it is demonstrated that the global efficiency of the turbine increases by means of this active flow control technique. Several flow phenomena such as vortex shedding and their interference with the blades were also studied and analyzed.

Suggested Citation

  • Velasco, D. & López Mejia, O. & Laín, S., 2017. "Numerical simulations of active flow control with synthetic jets in a Darrieus turbine," Renewable Energy, Elsevier, vol. 113(C), pages 129-140.
    • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:129-140
    DOI: 10.1016/j.renene.2017.05.075
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    References listed on IDEAS

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    1. He-Yong Xu & Chen-Liang Qiao & Zheng-Yin Ye, 2016. "Dynamic Stall Control on the Wind Turbine Airfoil via a Co-Flow Jet," Energies, MDPI, vol. 9(6), pages 1-25, June.
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    3. Maître, T. & Amet, E. & Pellone, C., 2013. "Modeling of the flow in a Darrieus water turbine: Wall grid refinement analysis and comparison with experiments," Renewable Energy, Elsevier, vol. 51(C), pages 497-512.
    4. Greenblatt, David & Schulman, Magen & Ben-Harav, Amos, 2012. "Vertical axis wind turbine performance enhancement using plasma actuators," Renewable Energy, Elsevier, vol. 37(1), pages 345-354.
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    Cited by:

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    7. Acarer, Sercan, 2020. "Peak lift-to-drag ratio enhancement of the DU12W262 airfoil by passive flow control and its impact on horizontal and vertical axis wind turbines," Energy, Elsevier, vol. 201(C).

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