Delay or removal of aneurysm formation in the Anaconda wave energy extraction device
Delay or removal of aneurysm formation in the Anaconda wave energy extraction device
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DOI：
10.1016/j.renene.2012.10.050
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发表时间：
2013-07
期刊：
影响因子：
8.7
通讯作者：
A. Bucchi;G. Hearn
中科院分区：
文献类型：
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作者：
A. Bucchi;G. Hearn
任何膨胀超过临界压力的可扩张管都会形成动脉瘤。 Anaconda 波浪能装置由加压淹没管组成，当用适当频率的外部入射波激励时，在设定的充气压力下，可以产生内部膨胀波，从而提供更有效地提取波浪能的机制。可膨胀管的设计必须具有结构完整性并有利于凸出波与入射波匹配。凸出波速由内部流体密度和管膨胀性控制。后者很容易证明取决于管内的体积压力梯度。通过应用基于位移-压力的有限元公式，可以研究动脉瘤的可能性及其延迟或避免。选择用于有限元分析的应变能函数是 Yeoh 和三阶 Ogden 模型，因为作者之前已证明这些公式满足所需的麦克斯韦等面积规则，并在使用不同的实验应力-应变数据混合时提供最一致的预测。在总结了一组具有代表性的已知波能提取装置后，为了了解 Anaconda 的不同之处，本文研究了外部不可延伸加固物的部署范围和模式，以提供适当速度的膨胀波，同时克服 Anaconda 管内动脉瘤的发生。
Any distensible tube inflated beyond a critical pressure will experience aneurysm formation. The Anaconda wave energy device consists of a pressurised flooded tube, which when excited with an external incident wave of appropriate frequency, for the set inflation pressure, permits generation of internal bulge waves that provide the mechanism for more efficient wave energy extraction. The distensible tube must be designed to have structural integrity and to facilitate the bulge wave matching the incident wave. The bulge wave speed is governed by internal fluid density and tube distensibility. The latter is readily shown to be dependent upon volume–pressure gradient within the tube. With application of a displacement–pressure based finite element formulation the likelihood of aneurysm and its delay or avoidance can be investigated. The strain energy functions selected for use with the finite element analysis are the Yeoh and third-order Ogden model as these formulations have been previously shown by the authors to satisfy the required Maxwell equal area rule and provide the most consistent predictions when using different mixes of experimental stress-strain data. After summarising a representative set of known wave energy extraction devices, to appreciate how different Anaconda is, the paper looks at the extent and mode of deployment of an outer inextensible reinforcement to provide bulge waves of appropriate speed whilst also overcoming the onset of aneurysms within the Anaconda tube.