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<p>Paper describes experimental investigation of energy harvesting using a piezoelectric flag in low speed closed loop water tunnel. The flag is placed in the wake of both a static and a moving cylinders at various distances to identify the maximum power output configuration. Both the static and the vibrating cylinders are of same diameter (51.0&#xa0;mm) with the vibrating cylinder placed in the downstream of the static cylinder. The water velocity was varied from 0.08 to 0.38&#xa0;m/s in the test section. It was observed that the piezoelectric flag exhibited two transverse vibration modes instead of one resulting in enhanced energy output. The values of these two modal frequencies associated with the vibration modes are strongly dependent on the incident flow velocity and inter cylinder gap. In fact, the maximum values of these modal frequencies shift to lower velocities as the inter cylinder gap increases. Moreover, for the inter cylinder gap of 2.5 times cylinder diameter, the maximum output of 70µW is achieved. The results showed that output voltage can be improved by identifying the best configuration of various dependent variables which include flow speed and frequency of the system. The proposed design can provide a base for self-powered vortex induced vibrations based piezoelectric energy generation devices in water medium.</p>

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Experimental investigation of vortex induced vibrations based piezoelectric energy harvester performance with tandem cylinders arrangement in a water tunnel

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • M. Shoaib Ansari,
  • Luqman Ahmad Nizam,
  • R. Naseer,
  • Emad Uddin,
  • Muhammad Mahad Shah

摘要

Paper describes experimental investigation of energy harvesting using a piezoelectric flag in low speed closed loop water tunnel. The flag is placed in the wake of both a static and a moving cylinders at various distances to identify the maximum power output configuration. Both the static and the vibrating cylinders are of same diameter (51.0 mm) with the vibrating cylinder placed in the downstream of the static cylinder. The water velocity was varied from 0.08 to 0.38 m/s in the test section. It was observed that the piezoelectric flag exhibited two transverse vibration modes instead of one resulting in enhanced energy output. The values of these two modal frequencies associated with the vibration modes are strongly dependent on the incident flow velocity and inter cylinder gap. In fact, the maximum values of these modal frequencies shift to lower velocities as the inter cylinder gap increases. Moreover, for the inter cylinder gap of 2.5 times cylinder diameter, the maximum output of 70µW is achieved. The results showed that output voltage can be improved by identifying the best configuration of various dependent variables which include flow speed and frequency of the system. The proposed design can provide a base for self-powered vortex induced vibrations based piezoelectric energy generation devices in water medium.