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Investigation on galloping piezoelectric energy harvester considering the surface roughness in low velocity water flow

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  • Hu, Shen
  • Zhao, Daoli
  • Sun, Weipeng
  • Liu, Yuanyuan
  • Ma, Chenyuan

Abstract

The technology of using galloping piezoelectric energy harvester (GPEH) to obtain low velocity hydrokinetic energy has been developed. The surface roughness of the bluff body can affect the performance of GPEH and can be designed to suit requirements. This paper investigates a GPEH with two bluff bodies in elliptical cylinder shape and different surface roughness is considered. The vorticity and pressure with different surface roughness are analyzed by numerical simulation. The quasi-steady-state assumption is applied to obtaining hydrodynamic force. A piecewise distributed parameter model of GPEH is established and the approximate analytical solutions for model is derived. The related experiments are conducted and the results verify the model. The amplitudes of elliptical cylinders with short diameters of 20 mm and 25 mm are reduced by 22.05% and 31.08%, respectively, when surface is changed from its original state to a roughness of 6.3 μm. When flow velocity increases from 0.49 m/s to 0.55 m/s, the decline ratio in maximum output power falls from 61.35% to 43.6% for short diameter of 20 mm and from 88.15% to 54.55% for short diameter of 25 mm. Additionally, the surface roughness is positively correlated with the onset velocity and has an effect on optimal resistance.

Suggested Citation

  • Hu, Shen & Zhao, Daoli & Sun, Weipeng & Liu, Yuanyuan & Ma, Chenyuan, 2023. "Investigation on galloping piezoelectric energy harvester considering the surface roughness in low velocity water flow," Energy, Elsevier, vol. 262(PB).
    • Handle: RePEc:eee:energy:v:262:y:2023:i:pb:s036054422202360x
    DOI: 10.1016/j.energy.2022.125478
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    References listed on IDEAS

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