筏式波浪能俘获装置运行特性的数值研究

Study on the wave power absorption of a raft-typed wave energy collector

针对我国波浪波长较短,波高较小的特点,提出了一种新型的筏式波能俘获装置,并应用三维势流理论和波浪的辐射-衍射理论,采用水动力商业计算软件,分别将筏体铰接处的液压缸等效为理想线性粘性阻尼和最大抵抗阻力,对规则波作用下双筏体和三筏体的筏式波能俘获装置运动特性进行了数值模拟分析。结果表明:随着铰接处液压缸安设高度(实质上是组合参数)的增大,各个铰接处最大抵抗弯矩不断增大,最大相对转速不断减小,而平均发电功率先增大、并达到最大值后再减小,存在一个适当的组合参数使得发电功率为最大;三筏体中两铰接处波能俘获最大时所对应的组合参数并不相等。

In view of the feature that the waves around China have a shorter wave length and smaller wave height compared to that in Europe,a new tape of wave energy collector is presented in this paper.Ideal dampers and limited resistant forces are separately used to simply represent the hydraulic cylinders at the joint between two rafts.A hydrodynamic analysis commercial software based on the traditional threedimensional potential theory is used to analyze the hydrodynamic forces and motion responses at the joints of both two-rafts and three-rafts wave energy collector in regular waves.The results show that the maximum resistance moment at the joints increases while the maximum relative rotational velocity decreases gradually along with the setting height of the hydraulic cylinders(actually a combination parameter)increasing.With increase of the setting height,the average power produced increases first and then decreasing after reaching the maximum at a proper combination parameter.The proper combination parameters are different at different joints in a three-rafts wave energy collector.