自由流湍流积分长度尺度对风电场流动和发电的影响

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-16 DOI:10.1016/j.renene.2024.121804

Emily Louise Hodgson , Niels Troldborg , Søren Juhl Andersen

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引用次数: 0

摘要

通过对 Sx=8R 和 Sx=12R 两种间距（风机半径 R）的风电场进行大涡模拟，研究了自由流湍流积分长度尺度对风电场流动和发电量的影响。在保持相同湍流强度和速度的情况下，改变流入湍流的积分长度尺度 Lu∈[3.2R,12.0R]。较短的积分长度尺度导致第一个涡轮机尾流中的近尾流击穿速度加快，尾流恢复能力提高，从而使第二个涡轮机的功率输出大幅增加；两个间距分别增加了 42% 和 18%。前四台涡轮机的总输出功率分别增加了 8.6% 和 6.0%。对频谱、交叉相关性和夹带尺度也进行了研究，结果表明，第一台涡轮机打破了流入尺度，尾流产生的湍流主导了第二台涡轮机的流入。进一步深入到涡轮机排，主要的流动结构和夹带尺度都与尾流湍流和与涡轮机间距相匹配的更大的风电场产生的结构有关。这些结果表明，自由流湍流积分长度尺度对风电场的流动和发电量有重大影响，主要是通过影响风电场入口处的湍流发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Impact of freestream turbulence integral length scale on wind farm flows and power generation

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Impact of freestream turbulence integral length scale on wind farm flows and power generation

The impact of freestream turbulence integral length scale on wind farm flow and power production is investigated by conducting Large Eddy Simulations on wind farms with two spacings,

S_{x} = 8 R

and

S_{x} = 12 R

(turbine radius

R

). The integral length scale of inflow turbulence

L_{u}

is varied,

L_{u} \in [3.2 R, 12.0 R]

, while maintaining identical turbulence intensity and velocity. Shorter integral length scales lead to a faster near wake breakdown and improved wake recovery in the wake of the first turbine, causing substantial increases in the second turbine power output; 42% and 18% for the two spacings. Over the first four turbines, total power output increases by 8.6% and 6.0% respectively. Spectra, cross-correlations and entrainment scales are also examined and show that the first turbine breaks down inflow scales and wake-generated turbulence dominates the inflow to the second turbine. Further into the turbine row, dominant flow structures and entrainment scales are associated with both wake turbulence and larger wind farm-generated structures matching the turbine spacing. These results show that the freestream turbulence integral length scale has a significant impact on wind farm flows and power generation, mainly by impacting the development of wakes in the farm entrance.

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

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