CFD analysis of energy harvesting from flow induced vibration of a circular cylinder with an attached free-to-rotate pentagram impeller
Abstract A new converter consisting of an elastically mounted circular cylinder and a free-to-rate pentagram impeller is proposed to harness hydrokinetic energy from water currents. The vibration energy of the cylinder and the rotation energy of the impeller are harvested simultaneously. The two-way fluid-structure interaction simulations are employed to investigate the vibration and rotation response of the converter. The simulated Reynolds number range is 14,000 Re U r ). The presence and rotation of the impeller contribute to the hydrodynamic instability of the system at U r ≥ 9, where the rotational direction is constantly changing. The hydrodynamic instability brings about a wider flow wake and unstable vortex shedding, resulting in the enhancement of vibration and the increase of power. For such a rotation symmetric structure, increasing the torsional friction does not play a significant role in suppressing the hydrodynamic instability. The estimated power generating capacity is sensitive to flow velocity and additional damping ratio. The average power efficiency is about 22.6%, and the power density for a 5 D × 5 D staggered configuration with ζ harn of 0.031374 can reach 885.53 W/m 3 . Highlights A new device is proposed to harness energy from vibration and rotation simultaneously. Vibration of a cylinder with a pentagram impeller is studied at high Reynolds number. Effect of torsional friction on vibration response and mechanical power are examined. The rotation of impeller leads to a hydrodynamic instability at high reduced velocity. Effect of additional damping on the system dynamics and harvested power are studied.
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