Hydrodynamic Analysis Of A2D Onshore OWC Wave-power Converter

With the development of the economy, the source of fossil fuels becomes less andless, and energy crisis is becoming a global hot issue. However, the ocean covers70.8%of the earth surface, which possesses a large amount of renewable energy including windenergy, tidal energy, wave energy, tidal current energy, thermal energy and salinityenergy. It is signifcant to convert the clean wave energy into electricity.Because the coastal OWC (Oscillating Water Column) wave energy power deviceis not far from land areas, the cost of electricity transmission is low and easy to manage.Hence if the location and design of the OWC is optimal, high energy conversion efciencycan be obtained. The onshore OWC wave energy power device becomes popular andhas attracted much attention from scientists and engineers.However, up to now, the known studies to2D OWC devices are restricted on thecase of constant water depth. In this thesis, the study to the2D OWC devices isextended to the case with variable water depth. First, the seabed terrain of a verticalstep is considered. By using the method of eigenfunction expansion and the Galerkinapproximation, the solution of wave amplifcation factor is obtained. In our solution, wecan adjust not only the parameters of the OWC device but also the location and depthof the step, to analyse the capacity of the wave power catched by the device. Second, theseabed terrain of a slope outside the OWC device is considered. By employing multiplevertical steps to approximate the slope, the region with variable water depth is dividedinto a series of subregions with constant depth. In each subregion, the solution is easyto fnd. Based on our solution, the infuence of position, slope and the width of theslope on the wave amplifcation factor is analyzed.