Large-eddy simulations of turbulent flows in arrays of helical- and straight-bladed vertical-axis wind turbines

IF 1.9 4区工程技术 Q4 ENERGY & FUELS

Journal of Renewable and Sustainable Energy Pub Date : 2023-11-01 DOI:10.1063/5.0172007

Masoumeh Gharaati, Nathaniel J. Wei, J. Dabiri, L. Martínez‐Tossas, Di Yang

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Abstract

Effects of helical-shaped blades on the flow characteristics and power production of finite-length wind farms composed of vertical-axis wind turbines (VAWTs) are studied numerically using large-eddy simulation (LES). Two helical-bladed VAWTs (with opposite blade twist angles) are studied against one straight-bladed VAWT in different array configurations with coarse, intermediate, and tight spacings. Statistical analysis of the LES data shows that the helical-bladed VAWTs can improve the mean power production in the fully developed region of the array by about 4.94%–7.33% compared with the corresponding straight-bladed VAWT cases. The helical-bladed VAWTs also cover the azimuth angle more smoothly during the rotation, resulting in about 47.6%–60.1% reduction in the temporal fluctuation of the VAWT power output. Using the helical-bladed VAWTs also reduces the fatigue load on the structure by significantly reducing the spanwise bending moment (relative to the bottom base), which may improve the longevity of the VAWT system to reduce the long-term maintenance cost.

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螺旋叶片和直叶片垂直轴风力涡轮机阵列中湍流的大涡流模拟

本研究采用大涡流模拟（LES）对由垂直轴风力涡轮机（VAWT）组成的有限长度风电场的螺旋叶片对流动特性和发电量的影响进行了数值研究。在粗间距、中间距和密间距的不同阵列配置中，对两台螺旋叶片风力涡轮机（叶片扭转角相反）和一台直叶片风力涡轮机进行了研究。对 LES 数据的统计分析表明，与相应的直叶 VAWT 相比，螺旋叶片 VAWT 在阵列完全展开区域的平均发电量可提高约 4.94%-7.33% 。螺旋叶片 VAWT 还能在旋转过程中更平稳地覆盖方位角，从而使 VAWT 功率输出的时间波动降低约 47.6%-60.1%。使用螺旋叶片 VAWT 还可通过显著降低跨向弯矩（相对于底部基座）来减少结构的疲劳载荷，从而提高 VAWT 系统的使用寿命，降低长期维护成本。

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

Journal of Renewable and Sustainable Energy ENERGY & FUELS-ENERGY & FUELS

CiteScore

4.30

自引率

12.00%

发文量

122

审稿时长

4.2 months

期刊介绍： The Journal of Renewable and Sustainable Energy (JRSE) is an interdisciplinary, peer-reviewed journal covering all areas of renewable and sustainable energy relevant to the physical science and engineering communities. The interdisciplinary approach of the publication ensures that the editors draw from researchers worldwide in a diverse range of fields. Topics covered include: Renewable energy economics and policy Renewable energy resource assessment Solar energy: photovoltaics, solar thermal energy, solar energy for fuels Wind energy: wind farms, rotors and blades, on- and offshore wind conditions, aerodynamics, fluid dynamics Bioenergy: biofuels, biomass conversion, artificial photosynthesis Distributed energy generation: rooftop PV, distributed fuel cells, distributed wind, micro-hydrogen power generation Power distribution & systems modeling: power electronics and controls, smart grid Energy efficient buildings: smart windows, PV, wind, power management Energy conversion: flexoelectric, piezoelectric, thermoelectric, other technologies Energy storage: batteries, supercapacitors, hydrogen storage, other fuels Fuel cells: proton exchange membrane cells, solid oxide cells, hybrid fuel cells, other Marine and hydroelectric energy: dams, tides, waves, other Transportation: alternative vehicle technologies, plug-in technologies, other Geothermal energy