Angle of Attack Effects on the Wall-Pressure Fluctuations of an Airfoil in Turbulence

Bente J. Meijerink, Fernanda L. Dos Santos, Laura Botero-Bolívar, Cornelis H. Venner, Leandro D. de Santana

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Leading-edge noise is the dominant noise source in many engineering applications, such as fans and propellers, because these devices are exposed to a turbulent inflow. Amiet’s theory is widely used to predict the leading-edge noise for these applications. This theory was developed for a flat plate at zero angle of attack. However, in real applications, the fluid dynamic device is no longer a flat plate, and it often operates with an angle of attack. Furthermore, the basis for the Amiet’s leading-edge noise model is the wall-pressure fluctuations caused by the interaction of the inflow turbulence with the airfoil leading edge. Therefore, in this paper, we experimentally investigate the angle of attack effects on the wall-pressure fluctuations at the leading-edge region when the airfoil is submitted to a turbulent inflow. We also compare the measurements with Amiet’s theory for the wall-pressure fluctuations. In this research, a NACA 0008 airfoil was investigated because this geometry approximates the cross-section of a marine propeller. The research was performed in the UTwente Aeroacoustic Wind Tunnel. The wall-pressure fluctuations were measured by using the remote microphone probe technique. Amiet’s wall-pressure fluctuation prediction matches well with the experimental data for chordwise positions x/c ≤ 2.12% and for low angles of attack of 0 and 2 . For chordwise positions x/c≥ 5% and for angles of attack higher than 2, the spectral shape of Amiet’s prediction does not match well with the experimental wall-pressure fluctuation spectrum. This is because the wall-pressure fluctuations are affected by the transition from laminar to turbulent boundary layer as the angle of attack increases and for further downstream chordwise positions.

Original languageEnglish
Title of host publication28th AIAA/CEAS Aeroacoustics Conference, 2022
PublisherAmerican Institute of Aeronautics and Astronautics
ISBN (Print)9781624106644
Publication statusPublished - 13 Jun 2022
Event28th AIAA/CEAS Aeroacoustics Conference 2022 - Southampton, United Kingdom
Duration: 14 Jun 202217 Jun 2022
Conference number: 28


Conference28th AIAA/CEAS Aeroacoustics Conference 2022
Country/TerritoryUnited Kingdom


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