4.6 Article

Harvesting wind energy with a bi-stable configuration integrating vortex-induced vibration and galloping

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 54, Issue 28, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/abf809

Keywords

wind energy harvesting; snap-through motion; vortex-induced vibration; multi-stability; galloping

Funding

  1. National Natural Science Foundation of China [11672237, 52005155]
  2. China Postdoctoral Science Foundation [2020M673470]
  3. Key Scientific Research Project of Colleges and Universities in Henan Province [20A130001]
  4. Key Research Development and Promotion Project in Henan Province [202102310249, 212102310952]

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This paper introduces a wind energy harvester that combines VIV, galloping, and multi-stability, demonstrating through validation experiments its ability to maintain a large output in variable-speed wind environments.
This paper proposed a wind energy harvester that integrates the merits of vortex-induced vibration (VIV), galloping and multi-stability. Two different shapes of bluff bodies are introduced to induce VIV and galloping for incoming flow, respectively. Three magnets are placed on the beam and fixture so as to generate bi-stability by magnetic attraction. As the wind blows through, the induced aero-dynamical instability leads the piezoelectric beam to oscillate and execute snap-through motion, which could generate a large electric output. The validation experiment was conducted. The experimental results show that as the flow speed increases from v= 1.0 m s(-1) to 7.0 m s(-1), the harvester could begin snap-through motion from a low speed v = 1.5 m s(-1), and maintain the coherence resonance motion within a broad range of wind speed. Thus, it could maintain the large output in the environment of variable-speed wind.

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