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Systematic investigation of the flow evolution and energy extraction performance of a flapping-airfoil power generator

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  • Lu, Kun
  • Xie, Yonghui
  • Zhang, Di
  • Xie, Gongnan

Abstract

In this paper, an experimental and numerical study on the flow evolution and energy extraction performance of a flapping-airfoil power generator is conducted, and wide ranges of motion parameters are considered. PIV (Particle image velocimetry) method is used for flow visualization around the flapping airfoil, and numerical simulations predicting the flow field and power generation process are also conducted and compared with the test results. It is found that the computed flow field basically agrees well with the experimental results, and the power generation ability of the power generator is validated. At a fixed plunging amplitude H0, both the decreasing reduced frequency k at a fixed pitching amplitude θ0, and the increasing θ0 at a fixed k lead to larger sizes of flow separation. For the flapping motion studied, both plunging contribution and pitching contribution play important roles in the energy extraction, which is very different from the traditionally imposed flapping profile. Besides, at a fixed k, the increasing H0 induces a slight increase in pitching contribution, and the increasing θ0 is beneficial to power generation enhancement. Moreover, the increasing H0 induces a notable increase in output power at relatively low k, while it has little effect on efficiency enhancement.

Suggested Citation

  • Lu, Kun & Xie, Yonghui & Zhang, Di & Xie, Gongnan, 2015. "Systematic investigation of the flow evolution and energy extraction performance of a flapping-airfoil power generator," Energy, Elsevier, vol. 89(C), pages 138-147.
    • Handle: RePEc:eee:energy:v:89:y:2015:i:c:p:138-147
    DOI: 10.1016/j.energy.2015.07.053
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    References listed on IDEAS

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    Cited by:

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    5. Zhang, Yue & Yang, Fuchun & Li, Yuetai & Qiu, Wenlei, 2021. "Design and numerical investigation of a multi-directional energy-harvesting device for UUVs," Energy, Elsevier, vol. 214(C).
    6. Xu, Wenhua & Xu, Guodong & Duan, Wenyang & Song, Zhijie & Lei, Jie, 2019. "Experimental and numerical study of a hydrokinetic turbine based on tandem flapping hydrofoils," Energy, Elsevier, vol. 174(C), pages 375-385.
    7. Zhang, Yubing & Wang, Yong & Xie, Yudong & Sun, Guang & Han, Jiazhen, 2022. "Effects of flexibility on energy extraction performance of an oscillating hydrofoil under a semi-activated mode," Energy, Elsevier, vol. 242(C).
    8. Wang, Bo & Zhu, Bing & Zhang, Wei, 2019. "New type of motion trajectory for increasing the power extraction efficiency of flapping wing devices," Energy, Elsevier, vol. 189(C).
    9. Arun Raj Shanmugam & Ki Sun Park & Chang Hyun Sohn, 2023. "Comparison of the Power Extraction Performance of an Oscillating Hydrofoil Turbine with Different Deflector Designs," Energies, MDPI, vol. 16(8), pages 1-29, April.
    10. Ma, Penglei & Wang, Yong & Xie, Yudong & Zhang, Jianhua, 2018. "Analysis of a hydraulic coupling system for dual oscillating foils with a parallel configuration," Energy, Elsevier, vol. 143(C), pages 273-283.
    11. Sun, Guang & Wang, Yong & Xie, Yudong & Lv, Kai & Sheng, Ruoyu, 2021. "Research on the effect of a movable gurney flap on energy extraction of oscillating hydrofoil," Energy, Elsevier, vol. 225(C).
    12. Wu, Jie & Shen, Meng & Jiang, Lan, 2020. "Role of synthetic jet control in energy harvesting capability of a semi-active flapping airfoil," Energy, Elsevier, vol. 208(C).

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