Airfoil-shaped vortex generators for separation control and drag reduction on wind turbine blades

IF 2.3 3区工程技术 Q2 MECHANICS Acta Mechanica Pub Date : 2024-10-21 DOI:10.1007/s00707-024-04126-3

Hariprasanth Palanivel, Rinku Mukherjee

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Abstract

A passive flow control device, Clark-Y airfoil-shaped vortex generator (VG) on NREL Phase VI turbine blade, which has s809 airfoil section, is investigated. Both qualitative oil flow visualization from wind tunnel experiments and quantitative measures of aerodynamic coefficients using steady-state CFD with OpenFOAM are reported. Airfoil-shaped VGs are proposed and compared with traditional rectangular and triangular VGs. The use of airfoil-shaped VGs to delay separation, improving aerodynamic efficiency, inducing local pressure peaks and augmenting vorticity in the flow field are reported in detail. Results show that blades equipped with airfoil-shaped VGs provide a \(5\%\) lift coefficient increase and a \(27.68\%\) drag coefficient reduction compared to clean blades at a stall angle of \(\alpha = 11^\circ \). Airfoil-shaped VGs also generate more vorticity downstream compared to conventional VGs, contributing to maximum increase in peak vorticity inducing an additional momentum to the flow to delay separation without significant drag penalty. Thus, airfoil-shaped VGs offer a promising alternative to traditional VG designs.

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用于风力涡轮机叶片分离控制和减少阻力的翼形涡流发生器

研究了一种被动流控制装置，即 NREL 第六阶段涡轮叶片上的 Clark-Y 翼形涡流发生器（VG），其翼面截面为 s809。报告既有风洞实验的定性油流可视化，也有使用 OpenFOAM 进行稳态 CFD 的气动系数定量测量。提出了翼面形 VG，并与传统的矩形和三角形 VG 进行了比较。详细报告了如何利用翼面形 VG 来延迟分离、提高气动效率、诱导局部压力峰值和增强流场涡度。结果表明，在失速角为（α = 11^\circ）时，与干净的叶片相比，装有翼面形VG的叶片升力系数增加了（5\%\），阻力系数降低了（27.68\%\）。与传统的 VG 相比，翼面形 VG 还能在下游产生更多的涡度，从而最大程度地增加涡度峰值，为气流带来额外的动量，从而在没有明显阻力损失的情况下延迟分离。因此，翼面形 VG 有望成为传统 VG 设计的替代品。

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来源期刊

Acta Mechanica 物理-力学

CiteScore

4.30

自引率

14.80%

发文量

292

审稿时长

6.9 months

期刊介绍： Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.