Oscillating-water-column wave-energy device having a helical column

摘要

An oscillating-water-column (OWC) device for capturing energy from waves comprises a helical column B, C within which water can resonate. The helical column is formed by a spiral C running along the length of a column B. By having a helical column as opposed to a vertical one, the height of the wave energy device can be reduced while retaining the same column length required for resonance. The reduction in height of the column enables the device to be installed closer to shore, and operate closer to the surface of the sea. The device may comprise a central spine D, while two or three spirals C may run (collectively) clockwise or anticlockwise along the tube / column B to thereby form helical columns. A floatation buoy (A) is preferably attached to the OWC device. Preferably the oscillating water column drives an air turbine, which in turn drives a generator to produce electricity.