嵌入拉格朗日元法估算某些水下装置吸收波浪能研究(英文)

【摘要】：A simple approach is described to estimate the wave power absorption potential of submerged devices known to cause wave focusing and flow enhancement.In particular,the presence of a flow-through power take-off(PTO)system,such as low-head turbines,can be accounted for.The wave radiation characteristics of an appropriately selected Lagrangian element(LE)in the fluid domain are first determined.In the limit of a vanishing mass,the LE reduces to a patch of distributed normal dipoles.The hydrodynamic coefficients of this virtual object are then input in a standard equation of motion where the effect of the PTO can be represented,for example,as a dashpot damping term.The process is illustrated for a class of devices recently proposed by Carter and Ertekin(2011),although in a simplified form.Favorable wave power absorption is shown for large ratios of the LE wave radiation coefficient over the LE added mass coefficient.Under optimal conditions,the relative flow reduction from the PTO theoretically lies between 0.50 and 1 2≈0.71,with lower values corresponding to better configurations.Wave power capture widths,the sensitivity of results to PTO damping and sample spectral calculations at a typical site in Hawaiian waters are proposed to further illustrate the versatility of the method. 【作者单位】： Department
【关键词】： hydrodynamics wave power absorption wave energy conversion power take-off(PTO) Lagrangian element(LE) hydrodynamic coefficients
【基金】：Unsponsored(cost share)contribution to the U.S.Department of Energy through the Hawaii National Marine Renewable Energy Center(Hawaii Natural Energy Institute,University of Hawaii),Account No.6658090
【分类号】：P742
【正文快照】： 1 Introduction While the practicality and commercial viability of waveenergy converters(WEC)remains to be unambiguouslyestablished,the extraction of some of the mechanical powertransported across vast distances by surface water waves haschallenged the sc

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