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Flow jetting interference cylinder based on Venturi effect for enhancing wake-induced vibration energy harvesting

Author

Listed:
  • Zhang, Zhongcai
  • Shen, Haoting
  • Gao, Haili
  • Li, Haitao
  • He, Jian
  • Chou, Xiujian

Abstract

Low-power sensors in internet of things (IoT) and micro-electro-mechanical systems (MEMS) still face challenges in achieving a stable and highly efficient power supply. A novel flow jetting interference cylinder (FJIC) wind-induced vibration piezoelectric energy harvester is proposed based on the Venturi effect, aiming to achieve higher output power and extend the operating wind speed range. Within the upstream cuboid bluff body, a flow jetting interference cylinder features a tapered slot connecting the windward and leeward surfaces. Subsequently, the performance of wind-induced energy harvesters with three bluff bodies: single cylinder (SC), cuboid interference cylinder (baseline), and flow jetting interference cylinder is investigated through wind tunnel experiments, focusing on spatial and geometric factors such as the spacing ratio (S/D) and height ratios of the slot (Hr). Compared to the aerodynamic energy harvester with a single cylinder bluff body, at S/D = 1.5, the baseline energy harvester with an elastically supported interference cylinder (EIC-EH) and elastically supported flow jetting interference cylinder energy harvester (EFJIC-EH) exhibit VIV-galloping or VIV-VIV-galloping coupling phenomena, achieving optimal output power of 0.13 mW and 0.40 mW, respectively. Spectral analysis via the fast Fourier transform (FFT) further elucidates the coupling mechanism, demonstrating the presence of dual low-frequency components in VIV-galloping coupling. Furthermore, computational fluid dynamics (CFD) simulations of the equivalent spring-mass system and the two-way fluid-structure interaction (FSI) are performed and mutually verified, visualizing the aerodynamic enhancement mechanisms and showing a transition from a ‘P+2S’ to a ‘2P’ vortex-shedding mode. Finally, some practical application tests confirm the effectiveness and the extended operating range of the proposed flow jetting energy harvester.

Suggested Citation

  • Zhang, Zhongcai & Shen, Haoting & Gao, Haili & Li, Haitao & He, Jian & Chou, Xiujian, 2026. "Flow jetting interference cylinder based on Venturi effect for enhancing wake-induced vibration energy harvesting," Renewable Energy, Elsevier, vol. 257(C).
    • Handle: RePEc:eee:renene:v:257:y:2026:i:c:s0960148125025649
    DOI: 10.1016/j.renene.2025.124900
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