穿孔式双浮体装置水动力及波能转换特性研究

Hydrodynamic and wave energy conversion characteristics of perforated double-floating body device

为进一步解决波能转换装置向深水环境推进过程中存在能量转换效率问题,在现有双浮体点吸式波能装置基础上考虑穿孔阻尼板,提出新的穿孔双浮体带支撑立柱的结构形式。基于线性微幅波假设,通过特征函数展开和边界匹配的势流半解析方法,并结合多自由度振动理论,探索穿孔阻尼板对获能系统水动力、运动响应及俘获宽度比的影响。计算结果表明,阻尼板开孔会降低浮子及阻尼板自身受到的波浪激励力,浮子、阻尼板以及它们之间的耦合辐射作用力会随着阻尼板开孔半径增大而减小;阻尼板的开孔半径增大能有助于浮子与阻尼板的相对响应振幅;阻尼板会使系统出现两个耦合共振频率,在较小共振频率处的最优俘获宽度比均随着阻尼板开孔半径的增加先增大后减小。研究结果可为深水波浪能利用的工程应用提供理论基础,为后续振荡浮子波浪能发电装置优化提供依据。

In order to further solve the problem of energy conversion efficiency in the process of wave energy conversion device advancing into deep water environment,a new structure form of perforated double-floating body with supporting column was proposed based on the existing double-floating body point suction wave energy device adding perforated damping plate.Based on the assumption of linear micro-amplitude wave,combined with the multi-DOF vibration theory,effects of perforated damping plate on hydrodynamic force,motion response and capture width ratio of an energy harvesting system were explored by using the potential flow semi-analytical method of eigenfunction expansion and boundary matching.The computation results showed that opening of damping plate can reduce wave excitation force exerted on floater and damping plate;floater,damping plate and the coupled radiation force between them can decrease with increase in opening radius of damping plate;increase in opening radius of damping plate can help relative response amplitude between floater and damping plate;damping plate can make the system have two coupled resonance frequencies,the optimal capture width ratio at the smaller resonance frequency firstly increases and then decreases with increase in opening radius of damping plate;the study results can provide a theoretical foundation for engineering application of deep water wave energy utilization,and provide a basis for optimization of oscillating floater wave energy power generation device.