筏摆混合式波浪能转换装置性能的数值研究

NUMERICAL STUDY ON PERFORMANCE OF RAFT-PENDULUM HYBRID WAVE ENERGY CONVERTER

基于势流理论并引入粘性拖曳力,建立筏摆混合式波浪能转换装置的动力学模型。该装置由双浮体和单悬摆板铰接于一起的波浪能俘获系统和液压系统所组成。运用该模型研究能量输出系统、拖曳力系数、波浪要素和水流对装置性能的影响,阐明粘性对于此双俘能机制波浪能转换装置的影响规律。结果表明:与不考虑粘性所获得的结果相比,粘性对摆板纵摇运动的影响比对前、后浮体大;装置俘获宽度比的下降主要由于双浮体之间俘获能量的下降;在装置共振周期时,粘性对装置性能的影响最大,且随拖曳力系数和波幅的增加而单调增加。

A dynamic model of a raft-pendulum hybrid wave energy converter is presented based on potential flow with the consideration of viscous drag force. The wave energy converter is composed of a hydraulic system and a wave energy capture system consisting of a double floating body and a pendulum plate hinged together. Then the model is used to explore the influence of power take off system,drag force coefficient,wave parameters and water current on the performance of the device,and the effect law of viscosity on the wave energy converter of double energy harvesting mechanisms is clarified. It is revealed that,compared with the results obtained without the consideration of viscosity,the effect of viscosity on the pitching motion of the pendulum plate is obviously greater than that of the front and rear floaters,the decline of energy capture width ratio of the device is mainly due to the decrease of energy captured by the double floating body,and the effect of viscosity reaches the largest when wave period is close to the resonance period of the device,and it monotonically increases with the increase of drag force coefficient and wave amplitude.