浮摆式波能发电装置浮体系统的数值模拟

Numerical simulation of buoy system in floating and pendular-type wave energy converter

描述了浮摆式波能发电装置中浮体系统的收集原理,并对浮体系统的具体结构参数进行说明;在Workbench平台DesignModeler模块的基础上,对浮摆式波能发电装置中的浮体系统进行建模;对仿真过程中AQWA用到的基本方程、初始条件和需注意的事项进行了分析说明;并基于AQWA水动力学计算软件,对浮体的附加质量、辐射阻尼和RAO值进行计算,分析模拟了三种变化波况下浮体的运动响应情况,对浮箱的最大采集效率进行估算。仿真计算结果发现:1浮体的垂荡振幅大于浮箱的垂荡振幅,辐射阻尼随波浪频率的增大而增大,附加质量随波浪频率增大而缓慢减小;2周期和波高分别影响垂荡波形图的宽度和高度,周期较小时,应该注意锚链的疲劳断裂;3浮箱的最大采集效率为42.8%。

Energy-collection principle and parameters of floating-body system in a floating and pendular-type wave power generation device are described. A mathematical model of this system is developed based on the DesignModeler module in Workbench software platform, and details of initial conditions, basic equations, and precautions for simulation, are presented in this paper. The added mass, radiation damping, and RAO values of the floating body are calculated and its movement responses under three wave conditions are simulated based on AQWA software. The energy-collection efficiency of a buoyancy tank is also estimated. The results show that the heave amplitude of floating body is larger than that of buoyancy tank. With wave frequency increasing, the radiation damping of floating body increases while its added mass decreases. The wave period and wave height have effects on the width and height of heave waveform chart respectively, and fatigue fracture the anchor chain should be paid more attention when wave period is shorter. The maximum energy-collection efficiency of the buoyancy tank is 42.8%.