Aerodynamic noise characteristics of airfoils with morphed trailing edges

Hasan Kamliya Jawahar*, S Vemuri, Mahdi Azarpeyvand

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Numerical investigation of the aerodynamic and aeroacoustic characteristics of a symmetrical NACA 0012 airfoil developed by National Advisory Committee for Aeronautics (NACA) with a conventional hinged flap and a morphed flap has been carried out. The unsteady flow characteristics over the airfoil surface and at the airfoil wake are captured using high-fidelity Large Eddy Simulations. The tests were carried out for a freestream velocity of U1 = 20 m/s, corresponding to a chord-based Reynolds number of Rc = 2 105, at angles of attack = 0 and 4. The results of the airfoil static pressure distribution show that the airfoil with morphed trailing edge produces higher values of lift coefficient than the airfoil with hinged trailing edge due to its higher suction peak resulting in larger pressure difference
between the suction and pressure sides. Furthermore, from the wake-flow measurements, boundary-layer analysis, wall-pressure spectra, space-time correlation it is concluded that the Morphed airfoil produces higher values of surface pressure fluctuations near the trailing edge which extend farther into the wake of the trailing edge compared to the Hinged airfoil. Consequently, the increased pressure fluctuations at the vicinity of the trailing edge results in a higher values of radiated far-field noise for the airfoil with morphed trailing edge flap.
Original languageEnglish
Article number108892
JournalInternational Journal of Heat and Fluid Flow
Volume93
Issue number108892
Early online date3 Dec 2021
DOIs
Publication statusE-pub ahead of print - 3 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Inc.

Keywords

  • airfoil noise
  • aeroacoustics
  • morphing
  • LES
  • OpenFOAM
  • aerodynamics
  • Large Eddy Simulation
  • NACA 0012
  • Noise
  • flap

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