RESEARCH ON VORTEX-INDUCED VIBRATION AIRFLOW ENERGY HARVESTING PROPERTIES BASED ON LES METHOD

Hu Jie; Huang Junshi; Li Hong; Wen Jianping; Xiao Zhifeng; Li Bo

doi:10.19912/j.0254-0096.tynxb.2023-0058

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (5) : 70-76. DOI: 10.19912/j.0254-0096.tynxb.2023-0058

RESEARCH ON VORTEX-INDUCED VIBRATION AIRFLOW ENERGY HARVESTING PROPERTIES BASED ON LES METHOD

Hu Jie^1,2, Huang Junshi¹, Li Hong¹, Wen Jianping¹, Xiao Zhifeng¹, Li Bo^1,2

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Abstract

In this paper, the energy capture characteristics of the vortex-induced vibration piezoelectric energy harvesters （VIVPEHS） with two side-by-side circular cylinders are deeply studied, Based on the open-source platform of OpenFOAM & Matlab software, coupling calculation for vortex-induced vibration is taken on LES equation, second-order Van der pol equation and Gauss law. Meanwhile, the two side-by-side circular cylinders of VIVPEHS is prepared, and a energy collection platform is established for above model verification. The numerical results show that the lift and drag force, piezoelectric cantilever displacement, electromechanical conversion efficiency and wake morphology are in good agreement with the experimental data, and this results show the accuracy and rationality of VIVPEHS numerical calculation. Moreover, the results of experiment and calculation show that the output voltage （U） first increases and then decreases with the energy capture distance （S_n） increases when the cylinder diameter （D） is certain, the U is the largest at S_n=8D. In addition, the results of experiment and calculation show that the output power （P） first increases and then decreases with the increase of load impedance （R）. It is noteworthy that the P reaches 72 mW when the optimal R is 25000 Ω, and 21 commercial LEDs are lit by our device when D=0.1m,v=2.0m/s,S_n=8D.

Key words

wind energy / vortex-induced vibration / model / piezoelectric / aero-electromechanical coupling

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Hu Jie, Huang Junshi, Li Hong, Wen Jianping, Xiao Zhifeng, Li Bo. RESEARCH ON VORTEX-INDUCED VIBRATION AIRFLOW ENERGY HARVESTING PROPERTIES BASED ON LES METHOD[J]. Acta Energiae Solaris Sinica. 2024, 45(5): 70-76 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0058

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