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Optimization of Hydrokinetic Swept Blades

Author

Listed:
  • Miriam L. A. Gemaque

    (Graduate Program in Mechanical Engineering, Institute of Technology, Federal University of Pará, Av. Augusto Correa, 1, Belém 66075-900, PA, Brazil)

  • Jerson R. P. Vaz

    (Graduate Program in Mechanical Engineering, Institute of Technology, Federal University of Pará, Av. Augusto Correa, 1, Belém 66075-900, PA, Brazil)

  • Osvaldo R. Saavedra

    (National Institute of Science and Technology in Ocean and Fluvial Energies, Federal University of Maranhão, Av. dos Portugueses, 1966, São Luís 65080-805, MA, Brazil)

Abstract

The hydrokinetic turbine is used worldwide for electrical generation purposes, as such a technology may strongly reduce environmental impact. Turbines designed using backward swept blades can significantly reduce the axial load, being relevant for hydro turbines. However, few works have been conducted in the literature in this regard. For the case of hydrokinetic rotors, backward swept blades are still a challenge, as the authors are unaware of any optimization procedures available, making this paper relevant for the current state of the art. Thus, the present work develops a new optimization procedure applied to hydrokinetic turbine swept blades, with the main objective being the design of blades with reduced axial load on the rotor and possibly a reduction in the cavitation. The proposed method consists of an extension of the blade element momentum theory (BEMT) to the case of backward swept blades through a radial transformation function. The method has low computational cost and easy implementation. Once it is based on the BEMT, it presents good agreement when compared to experimental data. As a result, the sweep heavily affects the chord and twist angle distributions along the blade, increasing the turbine torque and power coefficient. In the case of the torque, it can be increased by about 18%. Additionally, even though the bound circulation demonstrates a strong change for swept rotors, Prandtl’s tip loss seems to be not sensitive to the sweep effect, and alternative models are needed.

Suggested Citation

  • Miriam L. A. Gemaque & Jerson R. P. Vaz & Osvaldo R. Saavedra, 2022. "Optimization of Hydrokinetic Swept Blades," Sustainability, MDPI, vol. 14(21), pages 1-13, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:21:p:13968-:d:954942
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    References listed on IDEAS

    as
    1. Vaz, Jerson R.P. & Okulov, Valery L. & Wood, David H., 2021. "Finite blade functions and blade element optimization for diffuser-augmented wind turbines," Renewable Energy, Elsevier, vol. 165(P1), pages 812-822.
    2. Ali Sadollah & Mohammad Nasir & Zong Woo Geem, 2020. "Sustainability and Optimization: From Conceptual Fundamentals to Applications," Sustainability, MDPI, vol. 12(5), pages 1-34, March.
    3. Larwood, Scott & van Dam, C.P. & Schow, Daniel, 2014. "Design studies of swept wind turbine blades," Renewable Energy, Elsevier, vol. 71(C), pages 563-571.
    4. Vaz, Jerson R.P. & Wood, David H., 2018. "Effect of the diffuser efficiency on wind turbine performance," Renewable Energy, Elsevier, vol. 126(C), pages 969-977.
    5. Hamilton Pessoa Picanço & Adry Kleber Ferreira de Lima & Déborah Aline Tavares Dias do Rio Vaz & Erb Ferreira Lins & Jerson Rogério Pinheiro Vaz, 2022. "Cavitation Inception on Hydrokinetic Turbine Blades Shrouded by Diffuser," Sustainability, MDPI, vol. 14(12), pages 1-22, June.
    6. Pavese, Christian & Kim, Taeseong & Murcia, Juan Pablo, 2017. "Design of a wind turbine swept blade through extensive load analysis," Renewable Energy, Elsevier, vol. 102(PA), pages 21-34.
    7. Rahim Zahedi & Alireza Zahedi & Abolfazl Ahmadi, 2022. "Strategic Study for Renewable Energy Policy, Optimizations and Sustainability in Iran," Sustainability, MDPI, vol. 14(4), pages 1-29, February.
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    Cited by:

    1. Jerson R. P. Vaz & Adry K. F. de Lima & Erb F. Lins, 2023. "Assessment of a Diffuser-Augmented Hydrokinetic Turbine Designed for Harnessing the Flow Energy Downstream of Dams," Sustainability, MDPI, vol. 15(9), pages 1-15, May.
    2. Mauro J. Guerreiro Veloso & Carlos H. P. dos Santos & Jerson R. P. Vaz & Antonio M. Chaves Neto, 2023. "Quasi-Steady Analysis of a Small Wind Rotor with Swept Blades," Sustainability, MDPI, vol. 15(13), pages 1-21, June.

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