Purpose

Nowadays flaps and winglets are one of the main mechanisms to increase airfoil efficiency. This study aims to investigate the power performance of vertical axis wind turbines (VAWT) that are equipped with diverse gurney flaps. This study could play a crucial role in the design of the VAWT in the future.

Design/methodology/approach

In this paper, the two-dimensional computational fluid dynamics simulation is used. The second-order finite volume method is used for the discretization of the governing equations.

Findings

The results show that the gurney flap enhances the power coefficient at the low range of tip speed ratio (TSR). When an angled and standard gurney flap case has the same aerodynamic performance, an angled gurney flap case has a lower hinge moment on the junction of airfoil and gurney flap which shows the structural excellence of this case. In all gurney flap cases, the power coefficient increases by an average of 20% at the TSR range of 0.6 to 1.8. The gurney flap cases do not perform well at the high TSR range and the results show a lower amount of power coefficient compare to the clean airfoil.

Originality/value

The angled gurney flap which has the structural advantage and is deployed to the pressure side of the airfoil improves the efficiency of VAWT at the low and medium range of TSR. This study recommends using a controllable gurney flap which could be deployed at a certain amount of TSR.

中文翻译：

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新型格尼襟翼设计提高垂直轴风力涡轮机的功率性能

目的

如今，襟翼和小翼是提高翼型效率的主要机制之一。本研究旨在调查配备不同轮床襟翼的垂直轴风力涡轮机 (VAWT) 的功率性能。这项研究可以在未来的 VAWT 设计中发挥关键作用。

设计/方法/方法

在本文中，使用了二维计算流体动力学模拟。二阶有限体积法用于控制方程的离散化。

发现

结果表明，格尼襟翼提高了低速比（TSR）范围内的功率系数。当斜角和标准格尼襟翼外壳具有相同的气动性能时，斜角格尼襟翼外壳在翼型和格尼襟翼连接处的铰接力矩较低，显示了这种外壳的结构优势。在所有格尼皮瓣病例中，功率系数在 TSR 范围为 0.6 至 1.8 时平均增加 20%。格尼襟翼案例在高 TSR 范围内表现不佳，与清洁翼型相比，结果显示功率系数较低。

原创性/价值

具有结构优势并部署在翼型压力侧的倾斜格尼襟翼提高了 VAWT 在中低 TSR 范围内的效率。本研究建议使用可在一定数量的 TSR 下部署的可控轮床皮瓣。