Effect of the installation position on the primary conversion performance of an oscillating water column wave energy converter attached on double slit caisson break water

Abstract

A ouble-slit breakwater has two water columns, one at the sea side and the other at the land side. an oscillating water column type wave energy converter has been proposed to utilize these chambers. In this presentation, the performance of a wave generator installed in both or one of the two chambers was evaluated in a water tank experiment. In the experiment, a 1/25 scale model of the actual system was used to evaluate the performance in regular waves. The regular waves ranged from 0.6 to 2.4 seconds with a wave height of 5 cm. Air chambers were installed on both the sea and land sides, and it was found that the water level amplitude of the seaward air chamber was larger at the short periods of 0.6 and 0.8 seconds, while the amplitude of the land side air chamber increased as the period increased. In other words, more energy is absorbed in the seaward air chamber in waves with short periods, and more energy is absorbed by the land-side air chamber in waves with long periods. The phase difference between the two air chambers was found to decrease as the period becomes longer. It was also confirmed that when air chambers were installed only on the seaward side or only on the landward side, the air chambers exhibited characteristics similar to a dynamic damper.