岸式振荡水柱波能转换装置的数值模拟

Numerical simulation of a land-based oscillating water column wave energy conversion device

针对岸式振荡水柱波能转换装置(OWC)的能量转换效率问题,采用基于域内源造波技术的时域高阶边界元方法(HOBEM),同时在气室内引入压强模型耦合气液相互作用,建立了自由水面满足完全非线性边界条件的二维时域数值波浪水槽模型。通过数值计算研究了岸式振荡水柱波能转换装置的前墙入水深度、前墙厚度、气室宽度及入射波要素对气室内波能转换效率的影响。结果表明:岸式振荡水柱波能转换装置存在一个明显的共振区间,前墙入水深度、厚度与气室宽度的减小均会导致共振频率的增大;前墙尺寸的变化对低频区能量转换效率的影响很小,而气室宽度的变化会影响整个工作频率区间的能量转换效率。

In order to investigate the energy conversion efficiency of a land-based oscillating water column （ OWC） , a two-dimensional time-domain numerical flume model has been founded based on a time-domain higher-order boundary element method （ HOBEM） with wave generation by the inner-domain source. Within the numerical mod-el, the pressure model is applied in the chamber and the fully nonlinear boundary conditions are satisfied on the free surface. Numerical experiments are performed to study the effects of the immersion depth and thickness of the front wall, width of the chamber and the various wave conditions on the energy conversion efficiency in the cham-ber. The numerical results show that there is a resonant region for the land-based oscillating water column wave en-ergy conversion device, and decreases of the immersion depth, thickness of the front wall, and the width of the chamber will increase the resonant frequency. The changes of the front wall size have little effect on energy conver-sion efficiency in the low-frequency region;however, the change of the chamber width influences the energy con-version efficiency in the whole working frequency region.