Hydrodynamic performance of a land-based multi-chamber OWC wave energy capture system: An experimental study

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering Pub Date : 2024-03-19 DOI:10.1016/j.coastaleng.2024.104510

Dezhi Ning , Lei Fu , Yu Zhou , Robert Mayon , Yuhang Zhang

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引用次数: 0

Abstract

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.

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陆基多腔 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进海洋波浪能捕获是一项具有挑战性的任务。多腔振荡水柱（OWC）装置因其潜在的高效特性而越来越受到青睐。本研究通过实验研究了陆基 OWC 波浪能捕获系统的水动力性能，该系统具有多个腔室（1 至 5 个）。研究考虑了自由表面高程、气压波动、水动力效率和反射系数。以图表形式展示了不同腔室数量的 OWC 系统中总腔室和分腔室的水动力效率。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，与传统的单腔设置相比，多腔布置改善了水动力能量提取特性。腔室水柱的滑动模式被用来有效捕获波浪能。随着腔室数量的增加，系统对长波的波浪衰减能力也有所提高。然而，当 OWC 箱体数量超过 3 个时，整体效率就会下降。腔室吃水对波浪能量捕获能力的影响最大，而由于腔室内的多重水柱相互作用，开口率和波浪高度的影响被削弱。等距子室结构在短波情况下具有整体效率和波浪衰减优势。本文旨在指导多室 OWC 系统的设计和优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Coastal Engineering 工程技术-工程：大洋

CiteScore

9.20

自引率

13.60%

发文量

审稿时长

3.5 months

期刊介绍： Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.