Analytical modelling of an U-Oscillating Water Column and performance in random waves
Analytical modelling of an U-Oscillating Water Column and performance in random waves
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DOI：
10.1016/j.renene.2013.04.016
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发表时间：
2013-12
期刊：
影响因子：
8.7
通讯作者：
G. Malara;F. Arena
中科院分区：
文献类型：
--
作者：
G. Malara;F. Arena
振荡水柱（OWC）技术被认为是在包括数百个有前途的设备的场景中开发海浪能的最有效解决方案之一。在这种背景下，新型的U-OWC设备最近被引入，作为OWC的进一步发展。该装置与传统的OWC不同，因为它利用一个小的垂直u型管道将气穴连接到开放波场。本文的目的是在水波线性化理论的背景下，提出与U-OWC相互作用的波场的一致表示，然后对U-OWC动力学进行分析描述。这种表示克服了目前在公开文献中提出的分析模型的缺点。此外，它允许包括以前被忽视的记忆效应。其次，通过蒙特卡罗仿真研究了U-OWC的性能。在这方面，为了测试该装置在与风浪和涌浪功率谱密度相适应的海浪中的效率，进行了几个模拟。效率是根据一些参数来评估的，这些参数可以突出显示系统吸收的大量能量。通过对单翼（带导叶和不带导叶）、双翼和对转涡轮性能的比较，研究了涡轮的影响。
The oscillating water column (OWC) technology is recognized as one of the most effective solutions for exploiting sea wave energy in a scenario including hundreds of promising devices. In this context, the novel U-OWC device has been recently introduced as a further development of the OWC. This device differs from the conventional OWC as it utilizes a small vertical U-duct for connecting the air pocket to the open wave field. The objective of this paper is to propose a consistent representation of the wave field interacting with the U-OWC in the context of a linearized theory of water waves and, then, an analytical description of the U-OWC dynamics. Such a representation overcomes the drawbacks of the analytical models proposed, at the present time, in the open literature. Moreover, it allows including memory effects previously neglected.Next, the performance of the U-OWC is investigated by Monte Carlo simulations. In this regard, several simulations are produced for testing the efficiency of the device in sea waves compatible with power spectral density of wind-generated waves and of swells. The efficiency is evaluated according to a number of parameters, that allow highlighting the remarkable amount of energy absorbed by the system. The influence of the turbine is investigated, as well, by comparing the performance of monoplane (with and without guide vanes), biplane and contra-rotating turbines.