Improving ocean wave energy capture in a cost-effective manner is a challenging task. Multi-chamber oscillating water column (OWC) devices are gaining favor due to their potentially efficient characteristics. This research experimentally investigated the hydrodynamic performance of a land-based OWC wave energy capture system with multiple chambers (ranging from 1 to 5). The free surface elevation, air pressure fluctuations, hydrodynamic efficiency, and reflection coefficient are considered. The hydrodynamic efficiencies of the overall, and sub-chambers in the OWC system with varying numbers of chambers are graphically presented. The influence of geometrical design parameters and wave conditions are also considered in evaluating the performance of the multi-chamber OWC system. It is found that the multi-chamber arrangement improves the hydrodynamic energy extraction characteristics compared to the traditional single-chamber setup. The sloshing mode of the chamber water column is utilized to effectively capture wave energy. As the number of chambers increases, the wave attenuation capability of the system improves for long waves. Yet, the overall efficiency declines when the number of OWC chambers exceeds 3. The chamber draft has the most substantial impact on the wave energy capturing capability, while the effects of opening ratio and wave height are attenuated due to multiple water-column interactions inside the chambers. The isometric sub-chamber structure demonstrates overall efficiency and wave attenuation advantages for short waves. The paper aims to guide the design and optimization of a multi-chamber OWC system.

中文翻译：

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陆基多室OWC波浪能捕获系统的水动力性能：实验研究

以具有成本效益的方式改善海浪能量捕获是一项具有挑战性的任务。多室振荡水柱 (OWC) 装置因其潜在的高效特性而受到青睐。本研究通过实验研究了具有多个腔室（范围从 1 到 5 个）的陆基 OWC 波浪能捕获系统的水动力性能。考虑了自由表面高程、气压波动、流体动力效率和反射系数。以图形方式显示了 OWC 系统中具有不同数量腔室的整体腔室和子腔室的流体动力效率。在评估多室OWC系统的性能时还考虑了几何设计参数和波浪条件的影响。研究发现，与传统的单室设置相比，多室布置改善了流体动力能量提取特性。利用舱室水柱的晃动方式有效捕获波浪能。随着腔室数量的增加，系统对长波的衰减能力提高。然而，当OWC室的数量超过3时，整体效率下降。室吃水对波浪能捕获能力的影响最大，而开口率和波高的影响由于室内多个水柱的相互作用而减弱。室。等距子室结构展示了短波的整体效率和波衰减优势。本文旨在指导多室 OWC 系统的设计和优化。