Studies on Hydrodynamic and Air-flow Characteristics of a New Type of Wave Energy Absorber with Oscillating Water Column
| Autor: | Ching-En Huang, 黃靖恩 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 This paper presents a new type of wave energy absorber embodying OWC system, and discussing its hydrodynamics and air-flow characteristics. Using both computational fluid dynamics (CFD) and physical model tests in this study. A CFD called Flow-3D was employed, which one-fluid model is used to simulate the flow field of the oscillation of water column, and two-fluid model is adopted to simulate the wind field. The experimental tests measured the oscillation of water column and used the high speed camera with laser system to do flow visualization. The results show that the simulations of the flow field, the wind field and the free surface variation of the water column are quite constant and the same with the experimental tests. According to the results, when the water column of the air chamber oscillating by the waves, it will compress the air and generate the wind speed at the device. When the water column rise up it will cause the air flow out from the device, and flow in when it comes down. From the stabilization of water column variation, the wind speed caused by the water column will also be stabilize. The study adopted different wave definitions to discuss the relation between the wind speed and the wind power. The result shows the larger of the wave height induce the larger of the wind speed which it was generated and produced much more wind power in the different incident wave height conditions. In the same wave height but different relative depth conditions,the OWC device will absorber more wind power when the relative depth is decreasing. When the width of the air chamber b over the structure width B from OWC device is increasing,the OWC device will absorber more wind power in the same wave height and relative depth conditions. The study also compare with the conventional OWC,and the result shows that the present one absorber more wind power than the conventional one. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|