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论文类型： 期刊论文

发表时间： 2018-09-01

发表刊物： APPLIED OCEAN RESEARCH

收录刊物： SCIE

卷号： 78

页面范围： 180-191

ISSN号： 0141-1187

关键字： Oscillating water column; Wave energy converter; Eigenfunction expansion; Potential flow theory; Dual-chamber

摘要： A novel cylindrical oscillating water column (OWC) wave energy converter (WEC) with double chambers is proposed to harvest the wave energy effectively in deep water. An analytical model is developed to investigate its hydrodynamic characteristics based on the linear potential flow theory and eigenfunction expansion technique. The computational domain is divided into six sub-domains. The unknowns are solved by matching the continuous conditions of the fluid velocity and velocity potential between neighboring sub-domains. A pneumatic model is adopted to describe the relationship between the air pressure in the chamber and turbine characteristics. Effects of the chamber volume and parameters of the turbine on the energy conversion efficiency are investigated. It is found that the chamber volume affects the OWC hydrodynamics seriously in the case of large turbine rotating speed. Three typical free-surface oscillation modes in the chamber are found, two of which contribute much to the energy conversion. The comparison between results of the single- and dual-chamber OWC-WECs shows that the effective frequency bandwidth of the dual-chamber OWC-WEC is broader than that of the single-chamber OWC-WEC.