Numerical study of turbulence intensity effects on energy-extraction performance of a semi-activated hydrofoil

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering Pub Date : 2025-10-06 DOI:10.1016/j.oceaneng.2025.123079

Hengliang Qu , Xin Li , Kai Zhu , Xueyan Li

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Abstract

Turbulence is a typical and key environmental dynamic factor influencing the performance of tidal current energy devices. This study numerically investigates the effect of turbulence intensity on the energy-extraction performance of a semi-activated hydrofoil. Three turbulence intensities of 0.9 %, 6.8 %, and 13.6 % were generated and calibrated. Results show that both the heaving response and energy-extraction performance first increase and then decrease significantly with rising turbulence intensity. Compared with the case of 0.9 % turbulence intensity, the maximum efficiency and power coefficient at turbulence intensity of 6.8 % were increased by 5.9 % and 9.7 %, respectively. In contrast, these metrics at turbulence intensity of 13.6 % decrease by 15.9 % and 18.6 %. At moderate turbulence intensity, strong vortical structures enhance fluid–hydrofoil interaction and improve hydrodynamic performance, whereas high turbulence has the opposite effect. To clarify the mechanism, power spectral density of lift, output power, and pressure, along with turbulent kinetic energy and proper orthogonal decomposition of velocity were analyzed. Results indicate that moderate turbulence promotes vortex formation and shedding, while high turbulence disrupts these processes and accelerates vortex dissipation through intensified interactions between small-scale vortices and the boundary layer.

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湍流强度对半活化水翼吸能性能影响的数值研究

湍流是影响潮流能装置性能的一个典型而关键的环境动力因素。本文对湍流强度对半活化水翼吸能性能的影响进行了数值研究。湍流强度分别为0.9%、6.8%和13.6%。结果表明：随着湍流强度的增大，脉动响应和抽能性能均呈现先增大后减小的趋势；与湍流强度为0.9%的情况相比，6.8%湍流强度下的最大效率和功率系数分别提高了5.9%和9.7%。相比之下，湍流强度为13.6%时，这些指标分别下降了15.9%和18.6%。在中等湍流强度下，强涡结构增强了流体-水翼的相互作用，改善了水动力性能，而高湍流强度则相反。为了阐明其机理，分析了升力、输出功率、压力的功率谱密度以及湍流动能和速度的适当正交分解。结果表明，中等湍流度促进了涡的形成和脱落，而高湍流度破坏了这些过程，并通过增强小尺度涡与边界层之间的相互作用加速了涡的消散。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean Engineering 工程技术-工程：大洋

CiteScore

7.30

自引率

34.00%

发文量

2379

审稿时长

8.1 months

期刊介绍： Ocean Engineering provides a medium for the publication of original research and development work in the field of ocean engineering. Ocean Engineering seeks papers in the following topics.