Aerodynamic and Aeroacoustic Characteristics of the NACA 0008 Airfoil

Fernanda L. dos Santos*, Laura Botero-Bolívar, Cornelis H. Venner, Leandro D. de Santana

*Corresponding author for this work

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

1 Citation (Scopus)
64 Downloads (Pure)

Abstract

This paper discusses the flow dynamics and the leading- and trailing-edge noise generated by a NACA 0008 airfoil to better understand the near- and far-field noise characteristics of thin airfoils. Experiments were performed in the Aeroacoustic Wind Tunnel of the University of Twente for a chord-based Reynolds number ranging from 3.2×105 to 1×106. The measurements consisted of static pressure along the chord, boundary layer at the trailing edge, wall-pressure fluctuations along the chord, and far-field radiated noise. The pressure distribution along the airfoil chord, the lift coefficient, and the boundary layer characteristics at the airfoil trailing edge for different angles of attack are discussed and compared with XFOIL simulations, showing a good agreement. In case of no inflow turbulence, trailing-edge noise is dominant. The wall-pressure fluctuations at the trailing edge and the far-field noise are slightly affected by the angle of attack. At stall, the energy content of the wall-pressure fluctuations in the low-frequency range and the spanwise correlation length increase considerably. In case of inflow turbulence generated by a rod, the wall-pressure fluctuations along the airfoil chord are strongly influenced by the inflow turbulence. The highest energy content of the wall-pressure fluctuations is at chordwise positions close to the leading edge. Leading-edge noise is the dominant noise source for low- and mid-frequencies. However, trailing-edge noise level is comparable with the leading-edge noise for high frequencies.

Original languageEnglish
Title of host publication33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022
PublisherInternational Council of the Aeronautical Sciences (ICAS)
Pages2674-2689
Number of pages16
Volume4
ISBN (Electronic)9781713871163
Publication statusPublished - 2022
Event33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022 - Stockholm, Sweden
Duration: 4 Sept 20229 Sept 2022
Conference number: 33

Conference

Conference33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022
Abbreviated titleICAS 2022
Country/TerritorySweden
CityStockholm
Period4/09/229/09/22

Keywords

  • Aeroacoustic
  • Aerodynamic
  • Airfoil noise
  • NACA0008

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