Theoretical and numerical studies of off-shore oscillating water column wave energy device

doi:10.3785/j.issn.1008-973X.2019.02.016

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (2): 325-335 DOI: 10.3785/j.issn.1008-973X.2019.02.016

Water Resources and Ocean Engineering

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.

Key words： oscillating water column (OWC) wave energy device computational fluid dynamics potential flow theory matched eigenfunction expansion method wave energy conversion efficiency

Received: 30 January 2018 Published: 21 February 2019

CLC:

O 352

Corresponding Authors: Zheng-zhi DENG E-mail: hanghuihu@zju.edu.cn;zzdeng@zju.edu.cn

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Cite this article:

Hang-hui HU,Zheng-zhi DENG,Yan-ming YAO,Xi-zeng ZHAO. Theoretical and numerical studies of off-shore oscillating water column wave energy device. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 325-335.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.02.016 OR http://www.zjujournals.com/eng/Y2019/V53/I2/325

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

Fig.1 Sketch of off-shore oscillating water column wave enery device

Fig.2 Time history curves of incident wave energy flux per unit width

Fig.3 Wave energy curves captured at PTO

Fig.4 Sketch of numerical tank model for wave-oscillating water column wave enery device

Tab.1 Different incident wave conditions of numerical validation for wave energy conversion

Fig.5 Water surface fluctuation and flow field inside and near oscillating water column wave energy device chamber

Fig.6 Locations of three water level monitoring points

Fig.8 Static pressure within oscillating water column wave energy device chamber and outlet velocity for PTO

Fig.7 Time series of surface elevations before, inside and after oscillating water column wave energy device chamber

Fig.9 Time history curves of pressure within oscillating water column wave energy device chamber, outlet velocity for PTO and absorbed wave power

Fig.10 Energy conversion efficiency versus different incident wave frequencies in oscillating water column wave energy device

Fig.11 Reflection and transmission coefficients versus different incident wave frequencies

Fig.12 Proportion of energy of each component versus different incident wave frequencies

Fig.13 Wave energy conversion efficiency versus different incident wave frequencies for different immersion depths

Fig.14 Wave energy conversion efficiency versus different incident wave frequencies for different thickness of walls

Fig.15 Wave energy conversion efficiency versus different incident wave frequencies for different chamber widths

Fig.16 Wave energy conversion efficiency versus different incident wave frequencies for different incident wave amplitudes

Fig.17 Flow fields and vorticities near bottom of oscillating water column wave energy device for different incident wave amplitudes

Fig.18 Spectra for different incident wave amplitudes


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