双浮体波浪能转换装置中重心布置对波浪能吸收影响分析

摘要

A two-body rolling wave energy conversion system (WECS) is proposed.The system utilizes the rolling difference between the upper buoy and the lower one.On the basis of the lower buoy' s stability,the rolling of the upper buoy determines the wave energy absorption.The buoy's rolling is determined by its natural frequency,which is mainly affected by the G.C position arrangement.Therefore,numerical simulation is applied.A box-shaped buoy is selected as the upper buoy,and the system working in long crest wave with ten conditions is analyzed,in order to find out how the G.C position arrangement influences the wave energy absorption and the PTO damping selection.The results show that G.C position arrangement does affect the wave energy absorption by changing the natural frequency,and a lower G.C.position can enlarge the frequency range,and can absorb more wave energy.%提出一种基于横摇运动的双浮体波浪能转换装置,利用水面浮体与水下浮体之间的相对横摇运动实现对波浪能的吸收.在保持水下浮体稳定的前提下,水面浮体的横摇运动决定了整个装置对波浪能吸收情况.水面浮体的横摇运动受其横摇固有频率的影响,主要是重心布置.为了合理选择水面浮体的重心位置,采用数值分析的方法对箱型浮体在长峰不规则波下的工作情况进行分析,讨论重心布置对波浪能吸收的影响以及对PTO参数选择的影响.结果表明,重心的布置可改变波浪能吸收的频段,重心布置越低,可吸收的波浪能频段越广,越有利于波浪能的吸收.