Water Resources and Ocean Engineering |
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Theoretical and numerical studies of off-shore oscillating water column wave energy device |
Hang-hui HU(),Zheng-zhi DENG*(),Yan-ming YAO,Xi-zeng ZHAO |
Ocean College, Zhejiang University, Zhoushan 316000, China |
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Abstract The boundary value problem of the interaction between the small amplitude wave and the off-shore oscillating water column (OWC) wave energy devices was solved by means of the matched eigenfunction expansion method based on the potential flow theory. A two-dimensional fully nonlinear wave-OWC numerical model was established by employing the FLUENT software and its associated user-defined function (UDF). The effects of the immersion depth, the width of the chamber, and the thickness of walls on the energy conversion efficiency were examined both in theoretical and numerical manners, and the comparison of the results of these two manners showed a good agreement. The performances of the OWC devices influenced by the incident wave amplitudes were investigated with the help of the numerical model. Results showed that the bandwidth of highly-efficient frequencies narrowed with the increase of the immersion depth, and the peak shifted to the low frequency region. The increase of walls’ thickness resulted in the decrease of energy conversion efficiency in the high frequency region, while having little effect on the low frequency region. The bandwidth of highly-efficient frequencies widened with the increase of the chamber width, and the peak shifted to the low frequency region. In addition, the increase of the incident wave amplitude caused the decrease of the energy conversion efficiency, especially near the resonant frequency.
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Received: 30 January 2018
Published: 21 February 2019
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Corresponding Authors:
Zheng-zhi DENG
E-mail: hanghuihu@zju.edu.cn;zzdeng@zju.edu.cn
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离岸式振荡水柱波能装置的理论及数值研究
基于势流理论, 利用匹配特征函数展开法,求解微幅波与离岸式振荡水柱(OWC)波能转换装置相互作用的边界值问题. 借助FLUENT软件及其用户自定义函数(UDF),建立二维完全非线性波-OWC装置数值模型. 从理论和数值上分析OWC装置吃水深度、气室宽度以及墙体厚度对波能转换效率的影响,解析解和数值结果吻合较好.依靠数值模型,模拟波高变化对OWC装置工作效率的影响. 研究表明:OWC装置吃水深度的增加会导致高效频率带宽变窄,峰值向低频区移动;墙体厚度的增加会导致高频区波能转换效率下降,但对低频区影响较小;气室宽度的增大会导致高效频率带宽变宽,峰值向低频区移动;波高的增大会导致波能转换效率下降,在共振频率附近尤为明显.
关键词:
振荡水柱波能转换装置,
计算流体动力学,
势流理论,
匹配特征函数展开法,
波能转换效率
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