Abstract
Wind-driven power harvestings attract attentions since their target wind speeds are quite low less than the so-called cut-in wind speed, which is generally recognized as around 3 m/s. The extant power harvestings driven by wind-induced-air-column-resonations (i.e. acoustic-pressures) are still lacking simplicity, scale flexibility and solid strategies for practical applications. Therefore, the piezoelectric power harvesters via acoustic-pressures driven by low-speedwind-forces with resonating-tubes and wind-collectors were invented so as to complement all the lacks. The wind-collector as well as the resonating-tube contributed to upraise the power harvesting density. The champion power harvesting density of 19.5 nW/dm2 could be procured at 2.3 m/s of an artificial wind and the optimal resonating-tube and wind-collector. Power harvesting proofs from the natural wind with low mean speeds down to about 0.6 m/s were successfully obtained. The cut-in wind speed of the prototype piezoelectric power harvester was found to be quite low as about 0.4 m/s, signifying its ubiquity. Finally, a multi-bundle pendant-type piezoelectric power harvester was specifically presented together with professing the solid and multiple strategies for practical applications.
Highlights
Nowadays, wind-force power generators mean conventional wind-turbine-based wind-force power generators [1] and wind-driven power harvestings with using piezoelectric elements [2] [3]
Supposing that an acoustic velocity is 330 m/s and only the quarter-standing-acoustic-wave is formed inside the “resonating-tube”, its appropriate length providing the champion piezoelectric power harvesting density via the acoustic-pressures driven by the wind-forces is calculated to be ranged from 91.7 to 275 mm
Since this piezoelectric power harvester is driven by the odd numbers times quarter-standing-acoustic-wave, of which their amplitudes surely depend on the wind-force, one of the keys for improving the power harvesting density is to increase the wind-force intromitting to the “resonating-tube”
Summary
Wind-force power generators mean conventional wind-turbine-based wind-force power generators [1] and wind-driven power harvestings with using piezoelectric elements [2] [3]. Acoustic energy itself has been investigated as one of the power harvesting sources because of its ubiquity and environmental friendliness [23] [24] [25] [26] Wind instruments, such as organ pipes, saxophones, bassoons and trumpets, are well-known to blare out by means of air-column-resonances. The power harvestings driven by wind-induced-air-column-resonations (i.e. acoustic-pressures) have emerged since efficient energy conversions from wind-forces to acoustic-pressures are rightfully realized [29] [30] [31]. They are considered to be lucking simplicity, scale flexibility and solid strategies for practical applications. This study has been carried out with taking particular note of such lacks so as to make up for them
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