Characteristics of vortex evolution around a cylindrical oscillating water column device: An experimental study
Characteristics of vortex evolution around a cylindrical oscillating water column device: An experimental study
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DOI：
10.1063/5.0177213
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发表时间：
2023-12
影响因子：
4.6
通讯作者：
Ben He;Yuan Lin;Wei Li;M. Wei;Fang He
中科院分区：
文献类型：
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作者：
Ben He;Yuan Lin;Wei Li;M. Wei;Fang He
利用振荡水柱（OWC）转换器与现有的水力/海岸结构已经成为一个重要的方法，为经济上可行的和环境上可持续的绿色发电设备的发展。将OWC变换器集成到海上风电涡轮机（OWT）组件中是风电产业化的一个很有前途的解决方案。本文对规则波条件下OWT-OWC系统的流动特性进行了实验研究，重点研究了涡结构的演变。采用粒子图像测速技术（PIV）对不同波高和波周期条件下的OWC转化器周围流场进行了测量。基于实测的速度场数据，采用Q准则对涡的演化进行了研究。结果表明，波浪周期对水流流态有显著影响。具体而言，波周期的增加增强了流场的三维性质。观察到OWC室外部的旋涡连接并形成三维涡环，阻碍了有效的波能转换。相反，波高的变化对流场演化的影响有限。然而，随着波高的增加，涡的强度和不对称性经历一个显着的上升，这使得它很难形成一个稳定的三维涡环。此外，基于最佳几何设计考虑，建议增加侧壁开口的横向角度和高度，以防止涡环形成并最大限度地减少障碍物，同时确保OWT的结构安全。
The utilization of oscillating water column (OWC) converters with existing hydraulic/coastal structures has emerged as a crucial approach for the development of economically viable and environmentally sustainable green power generation devices. Integrating OWC converters into offshore wind turbine (OWT) monopiles is a promising solution in wind power industrialization. This paper presents an experimental investigation of the flow characteristics of an OWT-OWC system under regular wave conditions, focusing on the evolution of vortex structures. Particle image velocimetry (PIV) is employed to measure the flow field surrounding the OWC converter under different wave heights and wave period conditions. Based on the measured velocity field data, the evolution of vortices is examined using the Q-criterion. The results indicate that the wave period significantly affects the flow patterns. Specifically, an increase in wave period enhances the three-dimensional nature of the flow field. The vortices outside the OWC chamber are observed to connect and form a three-dimensional vortex ring, hindering efficient wave energy conversion. Conversely, the variation in wave height exhibits limited impact on the flow field evolution. However, as the wave height increases, the vortex strength and asymmetry experience a significant rise, making it difficult to form a stable three-dimensional vortex ring. Moreover, based on optimal geometric design considerations, it is recommended to increase the lateral angle and height of the sidewall openings to prevent vortex ring formation and minimize obstructions, while ensuring the structural safety of the OWT.