摘要
振荡水柱波能转换装置的最大转换效率往往受到腔内水柱共振机制的直接影响。通过对装置的基本结构进行简化,提出了一种前墙可绕固定轴旋转的双垂板式结构系统,旨在通过前墙的旋转运动进一步加剧水柱的振荡,从而对腔内水柱的共振机制进行调节和控制。基于线性波理论,采用匹配特征函数展开法对波浪与双垂板结构的相互作用进行理论研究,针对流场在结构物尖角附近的奇异性特征,将公共界面上的速度分布基于切比雪夫多项式近似展开,并应用区域间的速度与压力连续条件进行求解。通过分析结构的几何参数对反射透射系数、平均波面高程、前墙旋转振幅以及前墙与水面间相位差的影响,深究其共振机理,为振荡水柱波能转换装置的效率优化机制提供理论依据。结果表明,在所研究的波浪频率范围内,前墙的自由旋转运动会加剧板间的平均波面高程,应用于波浪能转换装置中能进一步拓宽高效频率带宽。
The maximum conversion efficiency of an oscillating water column wave energy conversion device is directly affected by the resonance mechanism in the water column.By simplifying the basic structure of the device,a system of two vertical plates with a pitching front-wall is proposed with the aim of intensifying the oscillation of the water column to control its resonance mechanism.Based on linear water wave theory,the matched eigenfunction expansion method is employed to solve the boundary value problem.Auxiliary functions,expanded in Chebyshev polynomial,are introduced to approximate the singular behaviors of fluid field in the vicinity area of sharp corners.The continuous conditions of velocity and pressure between sub-domains are applied to solve the problem.The effects of the geometric parameters on the hydrodynamic performance such as reflection and transmission coefficient,average free-surface elevation between the two plates,amplitude of the pitching front-wall,phase difference between the pitching wall and the oscillating free-surface are explored thoroughly.Moreover,the resonance mechanism is investigated to provide theoretical basis for efficiency optimization of the oscillating water column devices.The results show that in the full frequency range,the free-pitching motion of the front-wall will increase the average wave surface elevation between the plates,which is more satisfactory for a wave energy conversion device in realistic conditions.
作者
欧泽挺
邓争志
任翔
赵西增
OU Zeting;DENG Zhengzhi;REN Xiang;ZHAO Xizeng(Ocean College, Zhejiang University, Zhoushan 316021, China)
出处
《海洋工程》
CSCD
北大核心
2021年第2期98-109,共12页
The Ocean Engineering
基金
国家自然科学基金资助项目(11702244)
水能资源利用关键技术湖南省重点实验室(PKLHD201707)。
关键词
线性波理论
波浪与结构物的相互作用
匹配特征函数展开法
双垂板
波能转换
振荡水柱式
linear water wave theory
wave-structure interaction
matched eigenfunction expansion method
two vertical surface-piercing plates
wave energy conversion
OWC
