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采用三维势流理论对多体波浪能发电装置进行频域水动力计算,分析极浅水效应和多体间相互作用对单体发电装置的水动力性能影响。利用Orcaflex软件建立多体波浪能发电装置数值模型,浮体间采用铰接进行连接,并利用弹簧单元模拟发电液压缸的弹性阻尼作用。为极浅水多体波浪能发电装置设计合理的锚泊方案,采用时域动态耦合方法进行分析,同时考虑极浅水效应、多体影响和二阶低频力,根据API规范对自存工况下的锚泊缆强度进行校核,并对确定选用的锚泊方案进行敏感性分析。分析计算结果发现:在进行浅水多浮体锚泊设计时,低频波浪载荷、多体相互作用和海底摩擦不可忽视;对于极浅水的锚泊系统设计,Lazy wave型锚泊形式优于传统悬链线式锚泊。研究工作为近海极浅水海域新型海洋能发电装置锚泊系统的设计提供了参考和新思路。
The three-dimensional potential flow theory is used to calculate the hydrodynamic performance of multi-body wave power generation device in frequency domain. The influence of extreme shallow water effect and multi-body interaction on the hydrodynamic performance of single-body power generation device is analyzed. The Orcaflex software is used to establish the numerical model of multi-body wave power generation device. The floating body is connected by hinging, and the elastic damping of the power generation hydraulic cylinder is simulated by the spring unit. The design of a reasonable mooring scheme for extremely shallow body multi-body wave power generation device is based on the time-domain dynamic coupling method. Considering the extremely shallow water effect, the multi-body influence and the second-order low frequency force, according to the API specification, The cable strength is checked and the sensitivity analysis of the selected anchoring scheme is performed. The results of analysis and calculation show that low frequency wave loads, multibody interaction and submarine friction can not be neglected in the design of mooring system with shallow water and multi-body. For very shallow water mooring system design, Lazy wave type anchoring is superior to traditional catenary mooring. The research work provides a reference and a new idea for the design of a new type of mooring system for marine power plants in offshore waters.