Surface curvature effects on the tonal noise performance of a low Reynolds number aerofoil

Shen, Xiang, Avital, Eldad, Zhao, Qinghe, Gao, Junhui, Li, Xiaodong, Paul, Gordon and Korakianitis, Theodosios (2017) Surface curvature effects on the tonal noise performance of a low Reynolds number aerofoil. Applied Acoustics, 125. pp. 34-40. ISSN 0003-682X

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Official URL: https://doi.org/10.1016/j.apacoust.2017.04.002

Abstract

This paper presents wind tunnel experiments to illustrate the effects of surface curvature on the aeroacoustic performance of airfoil E387. For the first time, surface curvature effects are considered in an investigation of the airfoil’s self-noise. To distinguish the effects of surface curvature, the CIRCLE method is applied to the airfoil E387 to remove slope-of-curvature discontinuities and the redesigned airfoil is denoted A7. Anechoic wind tunnel tests were performed with E387 and A7 at three low Reynolds numbers to investigate aeroacoustic performance by measuring airfoil self-noise at different angles of attack (AoA) and spatial positions. At 2° and 4° AoA, A7 presents a tone with a reduced amplitude compared with E387 due to its improved slope-of-curvature distribution. It is concluded that improving surface curvature distribution improves airfoil aeroacoustic performance.

Item Type: Article
Uncontrolled Keywords: Surface curvature, Airfoil self-noise, Tonal noise, Laminar separation bubble
Subjects: H400 Aerospace Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 18 Jun 2020 08:41
Last Modified: 18 Jun 2020 08:45
URI: http://nrl.northumbria.ac.uk/id/eprint/43490

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