Wave-Cavity Resonator: Experimental Investigation of an Alternative Energy Device

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dc.contributor.author Reaume, Jonathan Daniel
dc.date.accessioned 2015-12-21T17:34:02Z
dc.date.available 2015-12-21T17:34:02Z
dc.date.copyright 2015 en_US
dc.date.issued 2015-12-21
dc.identifier.uri http://hdl.handle.net/1828/6960
dc.description.abstract A wave cavity resonator (WCR) is investigated to determine the suitability of the device as an energy harvester in rivers or tidal flows. The WCR consists of coupling between self-excited oscillations of turbulent flow of water in an open channel along the opening of a rectangular cavity and the standing gravity wave in the cavity. The device was investigated experimentally for a range of inflow velocities, cavity opening lengths, and characteristic depths of the water. Determining appropriate models and empirical relations for the system over a range of depths allows for accuracy when designing prototypes and tools for determining the suitability of a particular river or tidal flow as a potential WCR site. The performance of the system when coupled with a wave absorber/generator is also evaluated for a range piston strokes in reference to cavity wave height. Video recording of the oscillating free-surface inside the resonator cavity in conjunction with free-surface elevation measurements using a capacitive wave gauge provides representation of the resonant wave modes of the cavity as well as the degree of the flow-wave coupling in terms of the amplitude and the quality factor of the associated spectral peak. Moreover, application of digital particle image velocimetry (PIV) provides insight into the evolution of the vortical structures that form across the cavity opening. Coherent oscillations were attainable for a wide range of water depths. Variation of the water depth affected the degree of coupling between the shear layer oscillations and the gravity wave as well as the three-dimensionality of the flow structure. In terms of the power investigation, conducted with the addition of a load cell and linear table-driven piston, the device is likely limited to running low power instrumentation unless it can be up-scaled. Up-scaling of the system, while requiring additional design considerations, is not unreasonable; large-scale systems of resonant water waves and the generation of large scale vortical structures due to tidal or river flows are even observed naturally. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ *
dc.subject Flow-induced vibration en_US
dc.subject Flow-induced resonance en_US
dc.subject resonant coupling en_US
dc.subject shear layer oscillations en_US
dc.subject free surface wave en_US
dc.subject standing gravity wave en_US
dc.subject Wave-cavity resonator en_US
dc.subject WCR en_US
dc.subject lock-on en_US
dc.subject large-scale vortical structure en_US
dc.subject free shear layer en_US
dc.subject Alternative energy device en_US
dc.subject design of alternative energy device en_US
dc.subject shallow flows en_US
dc.subject intermediate water wave en_US
dc.subject deep water wave en_US
dc.subject wave absorber en_US
dc.title Wave-Cavity Resonator: Experimental Investigation of an Alternative Energy Device en_US
dc.type Thesis en_US
dc.contributor.supervisor Oshkai, Peter
dc.degree.department Department of Mechanical Engineering en_US
dc.degree.level Master of Applied Science M.A.Sc. en_US
dc.description.scholarlevel Graduate en_US
dc.description.proquestcode 0547 en_US
dc.description.proquestcode 0548 en_US

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