Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
An Experimental Study of Transonic Flow about a Supercritical Airfoil
Author: An Experimental Study of Transonic Flow about a Supercritical Airfoil
Author: Frank W. SpaidAn Experimental Study of Transonic Flow about a Supercritical Airfoil
Author: An Experimental Study of Transonic Flow about a Supercritical Airfoil. Static Pressure and Drag Data Obtained from Tests of a Supercritical Airfoil and an NACA 0012 Airfoil at Transonic Speeds, Supplement
Author: An Experimental Study of Transonic Buffet of a Supercritical Airfoil with Trailing Edge Flap
Author: B. H. K. LeePublisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 80
Book Description
A supercritical airfoil with a trailing edge flap has been the subject of aerodynamic investigation in the National Aeronautical Establishment's High Reynolds Number 2-D Test Facility. The effects of flap deflection on buffet intensities and delay of buffet onset at transonic speeds were studied. Buffet boundaries for various flap angles were determined from the divergence of the fluctuating balance normal force measurements (C prime sub N). The onset of buffet was obtained from plots of C prime sub N versus C sub L at values of C sub L where the slope was 0.1. This value for the slope was arbitrarily chosen, but was found to give consistent results which agreed well with values computed from the criterion using the trailing edge pressure divergence for those cases where buffet onset is primarily due to trailing edge separation. For given flow conditions the deflection of the trailing edge flap altered the circulation and hence the position of the shock wave and its strength. The variations of these two quantities with flap angles were determined from pressure measurements carried out on the airfoil surface. The test was performed quite deep inside the buffet regime and shock wave oscillations were investigated from spectral analyses of the balance outputs. Fluctuations in the shock motion of approximately 70 Hz were detected. The drag of the airfoil was computed from the wake stagnation pressure deficit and the drag penalties for large flap angles were quite significant. Analysis of the wake profiles with flap settings was carried out to study the changes in wake characteristics. Canada. (fr).
Experimental Studies of Scale Effects on Oscillating Airfoils at Transonic Speeds
Author: An Experimental Investigation of a Supercritical Airfoil at Transonic Speeds
Author: George G. MateerComparison of Computational and Experimental Results for a Supercritical Airfoil
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781729136201
Category : Science
Languages : en
Pages : 36
Book Description
A computational investigation was performed to study the flow over a supercritical airfoil model. Solutions were obtained for steady-state transonic flow conditions using a thin-layer Navier-Stokes flow solver. The results from this computational study were compared with time-averaged experimental data obtained over a wide Reynolds number range at transonic speeds in the Langley 0.3-Meter Transonic Cryogenic Tunnel. Comparisons were made at a nominal Mach number of 0.72 and at Reynolds numbers ranging from 6 x 10(exp 6) to 35 x 10(exp 6). Rivers, Melissa B. and Wahls, Richard A. Langley Research Center RTOP 505-59-10-31...
Detailed Transonic Flow Field Measurements about a Supercritical Airfoil Section
Author: Numerical Study of Transonic Flow Over Oscillating Airfoils Using the Full Potential Equation
Author: Koji IsogaiPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 52
Book Description