Abstract:We have developed a n ew energy harvester for harnessing energy from the Kármán vortex street behind a b luff body in a water flow. I t converts flow energy into electrical energy through oscillation of a piezoelectric film. Oscillation of the piezoelectric film is induced by pressure fluctuation in the Kármán vortex street. Prototypes of the energy harvester are fabricated and tested. Experimental results show that an open circuit output voltage of 0.12 pp V and an instantaneous output power of 0.7 nW are generated when the pressure oscillates with an amplitude of ~0.3 kPa and a frequency of ~52 Hz. This approach has the potential of converting hydraulic energy into electricity for powering wireless devices. The low output power of the device can be improved by an optimization design procedure or by adopting a p iezoelectric material with higher piezoelectric constants. A n array of these devices with multiple resonant frequencies may be considered for energy harvesting from ambient flow sources.
A new miniature hydro-energy generator for harnessing energy from Kàrmàn vortex street behind a bluff body in a water flow is developed. The flow energy is converted into electrical energy by an assembly of a cantilevered piezoelectric beam and a flexible diaphragm. An analytical model for the energy harvester is developed. Prototypes of the energy generator are fabricated and tested. Experimental results show that an open-circuit output votage of 120 mVpp and an instantaneous output power of 0.7 nW are generated when the pressure oscillates with an amplitude of nearly 0.3 kPa and a frequency of about 52 Hz
Through density functional calculation and NMR spectroscopy, an unexpected bonding interaction between d(xy) and axial cyanides is revealed to account for the lower shielding of axial cyanide of ruffled [Fe(TRP)(CN)(2)](-) complexes with the contribution of the unusual low-spin electronic structure (d(xz)d(yz))(4)(d(xy))(1).
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