Abstract
A huge, natural energy is unused in oceans of the world, and development of power generation utilizing ocean energy is important though there are various advantages and faults compared with solar generation and wind power generation. In this study, we have paid attention to an oscillating water column type wave energy converter in various approaches. Then, we presents on a study and development of a physical model to be able to explain using a hypothesis of changing open and close systems that if the size of multiple jets is smaller in some degree amount of power generation increases as number of jets in a ceil of the converter increases.