集成波能转换功能的方箱—挡浪板式浮式防波堤水动力特性研究

浮式防波堤与振荡浮子式波浪能转换装置集成是一种较为合理的波浪能开发利用方式,基于方箱式浮式防波堤—波浪能转换集成系统和幕帘式防波堤的研究成果,提出了一种新型方箱—垂直挡浪板式浮式防波堤—波浪能转换集成系统,建立数学模型对该集成系统的水动力特性和能量输出特性进行研究。模型基于N-S方程,采用紧致插值曲线(CIP)方法结合浸没边界法(IBM)求解。运用数值模型探究在一定波浪条件下,动力输出系统(PTO)阻尼力的大小以及挡浪板对集成系统的水动力特性和能量转换特性的影响,得到如下结论:集成系统的俘获宽度比随PTO阻尼力的增大呈现先增大后减小的趋势,在阻尼力F_(PTO)=150 N时达到最大;相对于方箱型集成系统,增设0.1 m挡浪板后可使其最大俘获宽度比η_e提高33%左右;此外,集成系统的俘获宽度比随挡浪板长度增加而增大,增长趋势逐渐变缓,在挡浪板长度S_p=0.5 m时达到最大,此时俘获宽度比η_e=0.563 1。

A study on hydrodynamic characteristics of a box-wave board type floating breakwater-wave energy converter integrated system

Wave energy converter integrated system is an appropriate way to utilize wave energy, as floating breakwater is combined with oscillating wave energy devices. Based on the studies on box-type floating breakwater-wave energy converter integrated system and curtain-type breakwater, a new box floating breakwater-wave energy converter integrated system with the vertical wave board is proposed. Hydrodynamic characteristics and power take-off characteristics of the integrated system are investigated by the mathematical model based on the N-S equation. The mathematical model is solved by the constrained interpolation profile (CIP) method and the immersed boundary method (IBM). Based on the numerical model, the influences of the power take-off PTO damping force and length of the wave board on the hydrodynamic characteristics and power take-off characteristics of the integrated system are investigated. The conclusions are as follows:The capture width ratio of the integrated system increases firstly and then decreases as the PTO damping force increases, and reaches the maximum when the PTO damping force is 150 N. In addition, when the PTO damping is 150 N and the wave board length is 0.1 m, the maximal capture width ratio increases by about more 33% than the box-type floating breakwater-wave energy converter integrated system. Moreover, the capture width ratio of the integrated system increases as the length of the wave board increases, and the growth trend gradually slows down. The capture width ratio reaches the maximum 0.563 1 when the length of the wave board is 0.5 m.