This paper aims to explain how a pair of coupled oscillating hydrofoils can be used to exploit tidal flows cost effectively. This approach is compared with other promising approaches to tidal power extraction, as well as previous oscillating hydrofoil research.
It outlines how oscillating foil systems can offer significant advantages over axial flow rotors if comparable power capture efficiencies can be achieved. It then explains how coupling a pair of foils can help achieve the required efficiency, and overcome other challenges which are inherent to oscillating systems.
It briefly discusses the current project to build a grid-connected 100kW demonstrator system in The Humber, and outlines the plans for future development and commercial exploitation.