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                                       Details van artikel 9 van 25 gevonden artikelen
 
 
  Measurement of Aerodynamic Noise and Unsteady Flow Field around a Symmetrical Airfoil
 
 
Titel: Measurement of Aerodynamic Noise and Unsteady Flow Field around a Symmetrical Airfoil
Auteur: S. Tomimatsu
N. Fujisawa
Verschenen in: Journal of visualization
Paginering: Jaargang 5 (2003) nr. 4 pagina's 381-388
Jaar: 2003-02-03
Inhoud: The purpose of this paper is to study the physics of aerodynamic noise generation from the symmetrical airfoil of NACA 0018 in a uniform flow. The relationship between the noise spectrum and the unsteady flow field around the airfoil is studied in an acoustic wind tunnel using flow visualization and PIV analysis. The discrete frequency noise was generated from the airfoil inclined at small angle of attack to the free stream. The flow visualization result indicates the presence of attached boundary layer over the suction side and the separated shear layer over the rear pressure side of the airfoil, when the discrete frequency noise is observed. It is found from the PIV analysis that a large magnitude of vorticity is generated periodically from the pressure side of the trailing edge and it develops into an asymmetrical vortex street in the wake of the airfoil. The periodicity of the shedding vortices was found to agree with that of the frequency of the generated noise.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 9 van 25 gevonden artikelen
 
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