Purpose

This study aims to investigate the effect of downstream characteristics of S809 wind turbine blade with various extended flat plate (EFP) configuration. Wind farms are recently modified to improve the power production through placing number of wind turbines and locations.

Design/methodology/approach

A series of wind tunnel experiments were carried out to evaluate the downstream wake characteristics of the S809 airfoil attached with various EFP (EFP, A = 0.1C, 0.2C and 0.3C) at various angles of attack corresponding to free stream velocity Reynolds number (Re) = 2.11 × 105 and various turbulence intensity (TI = 5%, 7%, 10% and 12%).

Findings

For the S809 wind turbine blade attached with EFP, the downstream velocity ratio decreases with increasing in angle of attack and the velocity deficit decrease with increasing turbulence intensity (TI) up to TI = 10%. The wake intensity for the S809 wind turbine blade and S809 airfoil with 10% of chord EFP performs the same for each downstream location.

Practical implications

Placing the wind turbine in the wind park next to another wind turbine poses a potential challenge for the park power performance. This research addresses the characteristics of the downstream turbulence intensity profile modified with the EFP in the wind turbine blade which improves the downstream characteristics of the turbine in the wind park.

Originality/value

The downstream velocity ratio decreases with increasing angle of attack and the velocity deficit decrease with increasing turbulence intensity (TI) up to TI = 10%.

中文翻译：

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S809风电叶片加长平板后缘在不同湍流强度下的下游特性

目的

本研究旨在研究具有各种扩展平板（EFP）配置的S809风力涡轮机叶片下游特性的影响。最近对风电场进行了改造，通过放置一定数量的风力涡轮机和位置来提高发电量。

设计/方法论/途径

进行了一系列风洞实验，以评估附有各种 EFP（EFP，A = 0.1C、0.2C 和 0.3C）的 S809 翼型在与自由流速度雷诺数相对应的各种攻角下的下游尾流特性（ Re) = 2.11 × 105 和各种湍流强度（TI = 5%、7%、10% 和 12%）。

发现

对于附有EFP的S809风力涡轮机叶片，下游速度比随着攻角的增加而减小，并且速度赤字随着湍流强度(TI)的增加而减小，直至TI = 10%。对于每个下游位置，具有 10% 弦 EFP 的 S809 风力涡轮机叶片和 S809 翼型的尾流强度表现相同。

实际影响

将风电场中的风力涡轮机放置在另一台风力涡轮机旁边，对风电场的电力性能提出了潜在的挑战。本研究解决了风力涡轮机叶片中使用 EFP 修改的下游湍流强度剖面的特性，从而改善了风电场涡轮机的下游特性。

原创性/价值

下游速度比随着攻角的增加而减小，速度赤字随着湍流强度 (TI) 的增加而减小，直至 TI = 10%。