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Aerodynamic Performance Analysis of Trailing Edge Serrations on a Wells Turbine

Author

Listed:
  • Abdullah Saad Alkhalifa

    (Mechanical Engineering Department, North Carolina A&T State University, Greensboro, NC 27411, USA)

  • Mohammad Nasim Uddin

    (Mechanical Engineering Department, North Carolina A&T State University, Greensboro, NC 27411, USA)

  • Michael Atkinson

    (Mechanical Engineering Department, North Carolina A&T State University, Greensboro, NC 27411, USA)

Abstract

The primary objective of this investigation was to explore the aerodynamic impact of adding trailing edge serrations to a Wells turbine. The baseline turbine consists of eight NACA 0015 blades. The blade chord length was 0.125 m and the span was 0.100 m. Two modified serrated blade configurations were studied: (1) full-span, and (2) partial-span covering 0.288c of the trailing edge. The numerical simulations were carried out by solving the three-dimensional, incompressible steady-state Reynolds Averaged Navier-Stokes (RANS) equations using the k-ω SST turbulence model in ANSYS™ (CFX). The aerodynamic performance of the modified Wells turbine was compared to the baseline by calculating non-dimensional parameters (i.e., torque coefficient, pressure drop coefficient, and turbine efficiency). A comparison of the streamlines was performed to analyze the flow topology around the turbine blades for a flow coefficient range of 0.075 ≤ ϕ ≤ 0.275, representing an angle of attack range of 4.29° ≤ α ≤ 15.3°. The trailing edge serrations generated a substantial change in surface pressure and effectively reduced the separated flow region, thus improving efficiency in most cases. As a result, there was a modest peak efficiency increase of 1.51% and 1.22%, for the partial- and full-span trailing edge serrations, respectively.

Suggested Citation

  • Abdullah Saad Alkhalifa & Mohammad Nasim Uddin & Michael Atkinson, 2022. "Aerodynamic Performance Analysis of Trailing Edge Serrations on a Wells Turbine," Energies, MDPI, vol. 15(23), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:9075-:d:989143
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    References listed on IDEAS

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    1. Halder, Paresh & Samad, Abdus & Thévenin, Dominique, 2017. "Improved design of a Wells turbine for higher operating range," Renewable Energy, Elsevier, vol. 106(C), pages 122-134.
    2. Setoguchi, T & Santhakumar, S & Takao, M & Kim, T.H & Kaneko, K, 2001. "Effect of guide vane shape on the performance of a Wells turbine," Renewable Energy, Elsevier, vol. 23(1), pages 1-15.
    3. Setoguchi, T. & Santhakumar, S. & Takao, M. & Kim, T.H. & Kaneko, K., 2003. "A modified Wells turbine for wave energy conversion," Renewable Energy, Elsevier, vol. 28(1), pages 79-91.
    4. Mohamed, M.H. & Janiga, G. & Pap, E. & Thévenin, D., 2011. "Multi-objective optimization of the airfoil shape of Wells turbine used for wave energy conversion," Energy, Elsevier, vol. 36(1), pages 438-446.
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    Cited by:

    1. Mohammad Nasim Uddin & Michael Atkinson & Frimpong Opoku, 2023. "CFD Investigation of a Hybrid Wells Turbine with Passive Flow Control," Energies, MDPI, vol. 16(9), pages 1-28, April.
    2. Wang, Ru & Cui, Ying & Liu, Zhen & Li, Boyang & Zhang, Yongbo, 2024. "Numerical study on unsteady performance of a Wells turbine under irregular wave conditions," Renewable Energy, Elsevier, vol. 225(C).

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