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Enhancing piezoelectric energy harvesting from the flow-induced vibration of an apple-shaped bluff body based on topology optimization

Author

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  • Du, Wenfeng
  • Liang, Lutong
  • Zhou, Zhiyong
  • Qin, Weiyang
  • Huang, Haobo
  • Cao, Di

Abstract

This study introduces an apple-shaped bluff body for wind energy harvesting, developed through topology optimization, to significantly enhance energy conversion efficiency by coupling vortex-induced vibrations and galloping. Compared with traditional shapes, the apple-shaped design features complex flow patterns of separation and reattachment, resulting in higher oscillation amplitudes and lower cut-in wind speeds. Prototypes with different stalk cavity angles (α) were tested. Wind tunnel experiments indicated that the apple-shaped structure (α = 80°) performed best at lower wind speeds (1.5–3.6 m/s). At higher wind speeds (3.6–5.0 m/s), the configuration with the angle of α = 120° was more advantageous for increasing voltage output. Additionally, adjusting the distance (L) between two stalk cavities of the apple-shaped structures (α = 80° and 120°) significantly affected the energy harvesting performance. The experimental results indicate that the most effective energy harvesting was achieved at L = 35 mm. Compared to a square prism, the apple-shaped structure (α = 120°, L = 35 mm) showed an 85 % increase in maximum voltage output. Computational fluid dynamics simulations validated the coupled vortex-induced vibration and galloping phenomena and superior energy harvesting performance of the apple-shaped bluff body. This study provides valuable insights into the design of efficient piezoelectric energy harvesters using topology optimization techniques.

Suggested Citation

  • Du, Wenfeng & Liang, Lutong & Zhou, Zhiyong & Qin, Weiyang & Huang, Haobo & Cao, Di, 2024. "Enhancing piezoelectric energy harvesting from the flow-induced vibration of an apple-shaped bluff body based on topology optimization," Energy, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:energy:v:307:y:2024:i:c:s0360544224024411
    DOI: 10.1016/j.energy.2024.132667
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    References listed on IDEAS

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