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Flow-induced vibration energy harvesting performance enhancing with venturi slit modulation effect

Author

Listed:
  • Li, Jinxia
  • Lin, Ji
  • Pu, Yunfan
  • Zhao, Liuxian
  • Wang, Junlei

Abstract

To enhance the performance of flow-induced vibration energy harvesters (FIVEH), a novel device incorporating an elastically installed bluff body with Venturi slit is proposed. The conceptual design of Venturi slit flow modulation is validated numerically and experimentally, demonstrating its capability to amplify pressure differences within the slit and accelerate fluid in the throat, thereby strengthening the alternating blowing-suction effect in the slit and enhance the vibration. In this work, the influences of the throat width of the Venturi slit S on vibration dynamics and energy harvesting performance are investigated through wind tunnel experiments. Two vibration modes are observed, vortex-induced vibration (VIV) and VIV-galloping interaction. Compared with the conventional smooth cylinder energy harvester, the proposed configuration increases the maximum output power by 177.4 %, extends the effective working range by 274.5 %, and enhances the mean output power by nearly four times. Furthermore, the working mechanism of Venturi slit modulation is elucidated via fluid-structure interaction simulations. The results indicate that the narrow-throat slit (S/D = 0.1–0.2) promotes earlier flow separation as well as vortex shedding closer to the trailing edge with a vortex pattern termed 2S-2P-fusion mode. In contrast, the wide-throat slit (S/D = 0.25–0.3) suppresses the blowing suction effect in the slit, disrupts the shear layer roll-up and entrainment, and finally leads to the vibration response of a sharper lower branch for VIV.

Suggested Citation

  • Li, Jinxia & Lin, Ji & Pu, Yunfan & Zhao, Liuxian & Wang, Junlei, 2025. "Flow-induced vibration energy harvesting performance enhancing with venturi slit modulation effect," Energy, Elsevier, vol. 341(C).
    • Handle: RePEc:eee:energy:v:341:y:2025:i:c:s0360544225051217
    DOI: 10.1016/j.energy.2025.139479
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    References listed on IDEAS

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