The Study of Converted Wave Energy by Using Air Pressure and Oscillating Water Column

• Main Authors: Chun-WeiMo, 莫鈞維
• Other Authors: Shih-Hsiung Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/83796694558994875864

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 101 === The purpose of this study is to design a wave-energy device to convert wave energy. Oscillating water column type of wave-energy device has a good adaptation for different topographies, and it is easy to design. Due to the loss of energy density, the method of generating power by using oscillating water column to push air would lower the output. In this experiment, a wave nergy device is designed to improve the power generating system. Also, it verifies the feasibility of using air pressure to generate oscillating water column in order to create the difference in the water level that can produce energy to push the water turbine. The device of the experiment is an oscillating water column type of energy device that its air chamber part is connected to a generator-sink. Therefore, the generator-sink and air chamber become an enclosed space. In this way, the oscillating water column changes the air pressure in the air chamber, and the inside air pressure changes the water level in the generator sink. To simplify the mechanism of this experiment, no turbine is installed on the wave-energy device. We can get the maximum potential energy by measuring the wave height on the air chamber wall, the air pressure between the air chamber and the generator sink, and the change of water level in the generator sink. The parameters of the wavemaker in this experiment are the local water depth, the stroke , and the frequency of paddle. The stroke of paddle is 0.2m, 0.3m, and 0.4m. The wave period is in the range of 1.5s to 3.4s. The ratio of the wave height in the generator sink to the wave height on the air chamber wall are 19% to 68%(when the stroke is 0.2m), 30% to 61%( when the stroke is 0.3m) , and 19% to 68%(when the stroke is 0.4m). Obviously, the maximum potential energy of the generator sink is larger than the potential energy when a wind turbine is equipped at the end of the air chamber.