Comparing nonlinear hydrodynamic forces in heaving point absorbers and oscillating wave surge converters
Comparing nonlinear hydrodynamic forces in heaving point absorbers and oscillating wave surge converters
复制标题
比较升起点吸收器和振荡波浪涌转换器中的非线性水动力
DOI：
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发表时间：
2017
影响因子：
1.9
通讯作者：
J. Ringwood
中科院分区：
文献类型：
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作者：
G. Giorgi;J. Ringwood
单自由度波浪能转换器的两种最常见的振荡模式是升沉和纵荡，它们分别由升沉点吸收器（HPA）和振荡波浪纵荡转换器（OWSC）利用。考虑到HPA和OWSC之间的主要流体动力学差异，不同的非线性力可能或多或少相关。同样，根据装置的类型，这种非线性力的标度特性可能不同，从而引入不确定性。本文研究了不同的非线性效应，以及不同的水动力分量的相关性，在HPA和OWSC。非线性弗劳德-克雷洛夫力，以及粘性阻力的影响，被认为是原型和全尺寸的设备尺寸。结果表明，非线性Froude-Krylov力是影响HPAs的主要因素，而OWSC中最重要的流体动力是衍射和辐射效应。此外，粘滞阻力似乎在HPA中几乎没有相关性，但在OWSC中有显著影响。最后，非线性显着影响不同的力分量的相位。
Two of the most common modes of oscillation of single degree of freedom wave energy converters are heave and surge, which are, respectively, exploited by heaving point absorbers (HPAs), and oscillating wave surge converters (OWSCs). Given major hydrodynamic differences between HPAs and OWSC, different nonlinear forces may be more or less relevant. Likewise, the scaling properties of such nonlinear forces may be different, according to the type of device, introducing uncertainties. This paper studies different nonlinear effects, and the relevance of different hydrodynamic force components, in HPAs and OWSCs. Nonlinear Froude–Krylov forces, as well as viscous drag effects, are represented and both prototype and full-scale device sizing are considered. Results show that HPAs are predominantly affected by nonlinear Froude–Krylov forces, while the most important hydrodynamic forces in OWSCs are diffraction and radiation effects. In addition, viscous drag appears to have little relevance in HPAs, but a significant influence in OWSCs. Finally, nonlinearities are shown to significantly affect the phase of the different force components.