Aeroacoustic effect of boundary layer separation control by rod vortex generators on the DU96-W-180 airfoil

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Journal of Fluids and Structures Pub Date : 2024-05-24 DOI:10.1016/j.jfluidstructs.2024.104133

Thanushree Suresh , Pawel Flaszynski , Alejandro Rubio Carpio , Marcin Kurowski , Michal Piotrowicz , Oskar Szulc

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Abstract

An experimental campaign to study the impact of a distinct type of vortex generator — rod type (RVG), on the flow characteristics and the acoustic far-field pressure of a wind turbine airfoil, is conducted. Airfoils exhibit decreased aerodynamic performance at high inflow angles due to turbulent boundary layer flow separation. RVGs are applied to mitigate the flow separation. However, this benefit is accompanied by an acoustic penalty. An assessment of the impact of RVGs on the far-field noise emission is conducted for the DU96-W-180 airfoil. The evolution of the boundary layer impacted by the rods is analyzed through Particle Image Velocimetry (PIV) measurements. The resulting reduction in the separation zone is observed through oil flow visualization. Analysis of the sound spectrum for airfoils with/without RVGs is conducted for a range of frequencies (300 Hz to 4000 Hz). Results show a reduction of the noise level at relatively low frequencies, at the expense of an increased noise level in the mid-high frequency ranges. While the former is caused by the reduction of the flow separation, the latter is determined by the combined contribution of the noise scattered by the RVG and by the change in boundary layer characteristics at the airfoil trailing edge.

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在 DU96-W-180 机翼上利用棒状涡流发生器控制边界层分离的气声效应

为了研究不同类型的涡流发生器--杆式涡流发生器（RVG）--对风力涡轮机机翼的流动特性和声学远场压力的影响，进行了一项实验活动。由于湍流边界层流动分离，机翼在高流入角时的气动性能下降。采用 RVG 可减轻流动分离。然而，这种好处伴随着声学上的损失。针对 DU96-W-180 机翼，对 RVG 对远场噪声排放的影响进行了评估。通过粒子图像测速仪（PIV）测量分析了受杆影响的边界层的演变。通过油流可视化观察分离区的缩小情况。对有/无 RVG 的机翼进行了一系列频率（300 Hz 至 4000 Hz）的声谱分析。结果表明，相对低频的噪音水平有所降低，但中高频范围的噪音水平有所提高。前者是由流动分离的减少造成的，而后者则是由 RVG 散射的噪声和机翼后缘边界层特性的变化共同决定的。

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 Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.