Hydrodynamic characteristics of Oscillating Water Column caisson breakwaters
Hydrodynamic characteristics of Oscillating Water Column caisson breakwaters
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DOI：
10.1016/j.renene.2016.11.028
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发表时间：
2017-04
期刊：
影响因子：
8.7
通讯作者：
Yu-Shu Kuo;Chih Yin Chung;S. Hsiao;Yu Kai Wang
中科院分区：
文献类型：
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作者：
Yu-Shu Kuo;Chih Yin Chung;S. Hsiao;Yu Kai Wang
本文采用有限差分软件FLOW-3D建立了振动水柱式沉箱防波堤的水动力特性数值模拟模型。数值模型通过水槽试验验证了空气与水的相互作用机理。通过对不同入射波参数的分析，评价了以下参数作为能量捕获效率指标：振幅放大倍数（a/a 0）、孔口风速（V ori）、空气振荡压力(H)、水动力效率（η H）、空气在一段时间内产生的能量（E air）和空气产生的平均功率（p air）。结果表明：最佳水动力效率（η h）的最佳无量纲波长比（L/ L c′）不同于空气产生的平均功率（P air）、振幅放大倍数（a/a 0）、孔口风速（V ori）和空气振荡压力（h P）的最佳无量纲波长比（L/ L c′）。在发电方面，本研究提出利用无量纲波长比（L/ L c′）与空气产生的平均功率（P air）之间的关系曲线，可以确定波浪能捕获的最佳范围，并设计OWC井箱防波堤的最佳尺寸。在空气产生的最大平均功率入射波条件下，侧力和基矩均有增大现象。
This study uses the finite difference software, FLOW-3D, to develop a numerical model to simulate the hydrodynamic characteristics for Oscillating Water Column (OWC) caisson breakwaters. The numerical model is verified by a flume channel experiment for the interaction mechanism between air and water. Through the analyses with different incident wave parameters of the OWC caisson breakwaters, the following parameters are evaluated as energy capture efficiency indices: the amplitude magnification (a/a 0), the air velocity at the orifice (V ori), the air oscillation pressure (H p), the hydrodynamic efficiency (η h), the energy produced by air for a period (E air), and the average power produced by the air (P air). The results show that the optimal dimensionless wavelength ratio (L/l c’) for the optimal hydrodynamic efficiency (η h) is different from the optimal dimensionless wavelength ratio (L/l c’) for the average power produced by the air (P air), the amplitude magnification (a/a 0), the air velocity at the orifice (V ori), and the air oscillation pressure (H p). For power generation purpose, this study suggests that the relationship curve between the dimensionless wavelength ratio (L/l c’) and the average power produced by air (P air) can be used to determine the optimal range for wave energy capture and to design the optimal size for the OWC caisson breakwaters. Under the incident wave conditions of maximum average power produced by air, the lateral force and the base moment has enlargement phenomenon.