Optimal Design of Wave Power Devices
By:Brian Pádraig Ó Gallachóir
Published on 2002 by
This thesis explores the optimal design of wave power devices from a hydrodynamic perspective. A methodology for the optimization of device design is developed and applied it to the Bristol Cylinder and the OWC (Oscillating Water Column). By developing a common approach to optimization for these devices, the methodology is readily applicable to a range of other devices. In addition, the influence on device performance by placing it within a tapered harbour is investigated. This work is timely due to the recently recognized potential benefits in terms of energy capture. The optimization methodology consists of a number of important steps, each of which provides an improvement in performance. Initially, the device geometry is fixed and the efficiency is maximized by tuning the power take off parameters to an incident wave frequency. The first step towards improvement in optimization is to maximize the efficiency bandwidth, rather than seeking the maximum efficiency at a single prescribed frequency. This allows the device to absorb more energy and thus perform optimally over the range of frequencies. The design is further improved by incorporating a site-specific wave power spectrum into the analysis. This is used to maximize the sea efficiency, thus arriving at the optimal fixed geometry device in the specific site. In the final step of this methodology, the fixed geometry constraints are relaxed and the sea efficiency is optimised with respect to the power take-off parameters, the geometry and the structural dimensions of the device. This procedure is shown to further improve device performance. The influence of tapered harbours on device performance is investigated using the method of matched asymptotic expansions. Prior to this thesis, the focus of mathematical modeling in this area has been restricted to rectangular harbours. Through careful selection of an appropriate Schwarz-Christoffel transformation, this existing work is expanded to the case of a tapered harbour. The optimal capture width of a device is then presented for different taper angles and a preliminary assessment of the influence of the tapered harbour is provided.
This Book was ranked at 33 by Google Books for keyword oscillating water column.
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