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Choosing an appropriate timber for a small wind turbine blade: A comparative study

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  • Pourrajabian, Abolfazl
  • Dehghan, Maziar
  • Javed, Adeel
  • Wood, David

Abstract

Despite the use of composite materials, timber is still widely used in the wind energy industry and especially in small wind turbine blades. Four species of timber namely alder, ash, beech and hornbeam which are grown in Iran were tested for their suitability for use in small blades. A solid blade is easiest to manufacture and is interesting from the structural aspect but its high inertia could delay starting since small turbines have no pitch mechanism to optimize the blade angles of attack during starting. We describe the design and optimization of solid and hollow blades for a small horizontal axis turbine via genetic algorithms. In order to maximize the power coefficient and minimize the starting time, the optimization algorithm tries to find the external/internal geometry of the blades while the resultant stresses do not exceed the allowable stress of the timbers. Regardless of the type of timbers, the optimization results show that the power coefficient of all the optimal blades is sufficiently high but the starting performance requires choosing an appropriate timber. More specifically, the alder solid blade would be better than the beech, hornbeam and ash. For the hollow blades, the alder and beech timbers could be used for windy areas and all four timbers are very promising for operation in low wind speed regions where starting behavior is more important.

Suggested Citation

  • Pourrajabian, Abolfazl & Dehghan, Maziar & Javed, Adeel & Wood, David, 2019. "Choosing an appropriate timber for a small wind turbine blade: A comparative study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 100(C), pages 1-8.
    • Handle: RePEc:eee:rensus:v:100:y:2019:i:c:p:1-8
    DOI: 10.1016/j.rser.2018.10.010
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    References listed on IDEAS

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    1. Mayer, C & Bechly, M.E & Hampsey, M & Wood, D.H, 2001. "The starting behaviour of a small horizontal-axis wind turbine," Renewable Energy, Elsevier, vol. 22(1), pages 411-417.
    2. Ebert, P.R. & Wood, D.H., 1997. "Observations of the starting behaviour of a small horizontalaxis wind turbine," Renewable Energy, Elsevier, vol. 12(3), pages 245-257.
    3. Pourrajabian, Abolfazl & Nazmi Afshar, Peyman Amir & Ahmadizadeh, Mehdi & Wood, David, 2016. "Aero-structural design and optimization of a small wind turbine blade," Renewable Energy, Elsevier, vol. 87(P2), pages 837-848.
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    Cited by:

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    4. Michal Lipian & Pawel Czapski & Damian Obidowski, 2020. "Fluid–Structure Interaction Numerical Analysis of a Small, Urban Wind Turbine Blade," Energies, MDPI, vol. 13(7), pages 1-15, April.

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