Accession Number : ADA133139

Title :   Unsteady Pressure and Force Measurements Associated with Transonic Buffeting of a Two-Dimensional Supercritical Airfoil (Mesures de Pression et de Force Instationnaires dues au Buffeting Transsonique d'un Profil Aerodynamique Surcritique Bidimensionnel).

Descriptive Note : Aeronautical note,

Corporate Author : NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Lee,B H K ; Ohman,L H

PDF Url : ADA133139

Report Date : Jun 1983

Pagination or Media Count : 89

Abstract : Buffet characteristics of the BGK No. 1 shockless airfoil have been investigated. Fluctuating pressure measurements along the airfoil chord and unsteady force balance data have been obtained in various regions inside the buffet regime close to the onset boundary curve. The Mach number range where buffet intensity reaches high values is determined from balance measurements. The rms values of the fluctuating pressure show generally monotonic increase downstream of the shock to the trailing-edge in this speed range. Statistical data from pressure and normal force measurements have been processed and the appearance of distinct frequency peaks in the power spectral density curves has been detected.

Descriptors :   *Supercritical wings, *Airfoils, *Aerodynamic characteristics, Buffeting, Unsteady flow, Pressure distribution, Pressure measurement, Boundary layer flow, Transonic flow, Downstream flow

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE