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Improved design of a Wells turbine for higher operating range

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  • Halder, Paresh
  • Samad, Abdus
  • Thévenin, Dominique

Abstract

The oscillating water column (OWC), which is a wave energy extracting device, uses a bidirectional flow turbine to generate power. The device performance largely depends on the efficiency, torque and operating range of the turbine. The turbine with a larger operating range produces power during a wider wave height and period, both properties changing throughout the year or during each wave cycle. In this article, a numerical work relying on design optimization is reported to show the dependency of power extraction capability to the operating range of the turbine. Reynolds-averaged Navier-Stokes (RANS) equations were solved and a surrogate approximation model was constructed to find an optimal design. Design variables were blade sweep angles at the tip and mid sections. The objective function, to be maximized, is the torque coefficient. The optimal design delayed the flow separation and the peak efficiency dropped by 3.1%. At the same time, the relative power output and the relative stall point were increased by 29% and 18% compared to the reference case, respectively.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:106:y:2017:i:c:p:122-134
    DOI: 10.1016/j.renene.2017.01.012
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    References listed on IDEAS

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    Cited by:

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    4. Paresh Halder & Hideki Takebe & Krisna Pawitan & Jun Fujita & Shuji Misumi & Tsumoru Shintake, 2020. "Turbine Characteristics of Wave Energy Conversion Device for Extraction Power Using Breaking Waves," Energies, MDPI, vol. 13(4), pages 1-17, February.
    5. Liu, Zhen & Cui, Ying & Li, Ming & Shi, Hongda, 2017. "Steady state performance of an axial impulse turbine for oscillating water column wave energy converters," Energy, Elsevier, vol. 141(C), pages 1-10.
    6. Das, Tapas K. & Samad, Abdus, 2020. "Influence of stall fences on the performance of Wells turbine," Energy, Elsevier, vol. 194(C).
    7. Nishi, Yasuyuki & Mori, Nozomi & Yamada, Naoki & Inagaki, Terumi, 2022. "Study on the design method for axial flow runner that combines design of experiments, response surface method, and optimization method to one-dimensional design method," Renewable Energy, Elsevier, vol. 185(C), pages 96-110.
    8. Geng, Kaihe & Yang, Ce & Zhao, Ben & Zhao, Wei & Gao, Jianbing & Hu, Chenxing & Zhang, Hanzhi & Wu, Wangxia, 2023. "Residual circulation budget analysis in a Wells turbine with leading-edge micro-cylinders," Renewable Energy, Elsevier, vol. 216(C).
    9. 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.
    10. Carrelhas, A.A.D. & Gato, L.M.C. & Henriques, J.C.C., 2023. "Peak shaving control in OWC wave energy converters: From concept to implementation in the Mutriku wave power plant," Renewable and Sustainable Energy Reviews, Elsevier, vol. 180(C).
    11. Kotb, Ahmed T.M. & Nawar, Mohamed A.A. & Attai, Youssef A. & Mohamed, Mohamed H., 2023. "Performance enhancement of a Wells turbine using CFD-optimization algorithms coupling," Energy, Elsevier, vol. 282(C).
    12. Liu, Zhen & Xu, Chuanli & Kim, Kilwon & Li, Ming, 2022. "Experimental study on the overall performance of a model OWC system under the free-spinning mode in irregular waves," Energy, Elsevier, vol. 250(C).
    13. Gato, L.M.C. & Maduro, A.R. & Carrelhas, A.A.D. & Henriques, J.C.C. & Ferreira, D.N., 2021. "Performance improvement of the biradial self-rectifying impulse air-turbine for wave energy conversion by multi-row guide vanes: Design and experimental results," Energy, Elsevier, vol. 216(C).
    14. Geng, Kaihe & Yang, Ce & Hu, Chenxing & Li, Yanzhao & Yang, Changmao, 2022. "Numerical investigation on the loss audit of Wells turbine with exergy analysis," Renewable Energy, Elsevier, vol. 189(C), pages 273-287.
    15. Morais, F.J.F. & Carrelhas, A.A.D. & Gato, L.M.C., 2023. "Biplane-rotor Wells turbine: The influence of solidity, presence of guide vanes and comparison with other configurations," Energy, Elsevier, vol. 276(C).
    16. Liu, Hua & Wang, Weijun & Wen, Yadong & Mao, Longbo & Wang, Wenqiang & Mi, Hongju, 2019. "A novel axial flow self-rectifying turbine for use in wave energy converters," Energy, Elsevier, vol. 189(C).
    17. Liu, Zhen & Cui, Ying & Xu, Chuanli & Sun, Lixin & Li, Ming & Jin, Jiyuan, 2019. "Experimental and numerical studies on an OWC axial-flow impulse turbine in reciprocating air flows," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.
    18. Nishi, Yasuyuki & Koga, Hiromichi & Wee, Yi Hong, 2023. "Multi-objective optimization of an axial flow hydraulic turbine with a collection device to be installed in an open channel," Renewable Energy, Elsevier, vol. 209(C), pages 644-660.

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