Piv Based Examination Of Dynamic Stall On An Oscillating Airfoil PDF Download
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Author | : Daniel E. Fredberg |
Publisher | : |
Total Pages | : 214 |
Release | : 2008 |
Genre | : Aerofoils |
ISBN | : |
Download PIV-based Examination of Dynamic Stall on an Oscillating Airfoil Book in PDF, ePub and Kindle
Author | : Lawrence W. Carr |
Publisher | : |
Total Pages | : 116 |
Release | : 1977 |
Genre | : Oscillating wings (Aerodynamics) |
ISBN | : |
Download Analysis of the Development of Dynamic Stall Based on Oscillating Airfoil Experiments Book in PDF, ePub and Kindle
Author | : Myung J. Rhee |
Publisher | : |
Total Pages | : 112 |
Release | : 2002 |
Genre | : Aerodynamic load |
ISBN | : |
Download A Study of Dynamic Stall Vortex Development Using Two-Dimensional Data from the AFDD Oscillating Wing Experiment Book in PDF, ePub and Kindle
The purpose of this study is to examine the previously unpublished instantaneous pressure data of the Aeroflightdynamics Directorate Two-Dimensional (2D) and Three-Dimensional (3D) Oscillating Wing Experiment to better understand the process of dynamic stall vortex development on the NACA 0015 airfoil. This report presents representative 2D instantaneous pressure data for the upper and lower surfaces of the airfoil at various chordwise locations obtained at specific angles of attack during upstroke and downstroke cycles. Furthermore, the report contains a complete set of plots of instantaneous pressure distributions for the upper surface for all the 2D data sets obtained in the experiment. First, the lift, drag and pitching moment data of various testing conditions are reviewed and analyzed to classify the data both with and without a boundary layer trip into "no stall," "moderate stall," and "deep stall" data. Next, instantaneous pressure distributions on the upper surface of the airfoil are examined for the study of vortex development. The lift and pitching moment data are analyzed to document the dynamic overshoot which delays the development of the stall on the airfoil. Next, the range of angles of attack are selected where the lift and pitching moment data shows significant changes from unsteady flow behavior daring oscillation cycles. Furthermore, based on the unsteady flow characteristics found in each classification of dynamic stall, analysis is continued to identify the conditions where the reduced frequency clearly affects the unsteady flow behavior of the airfoil during the oscillation. This can result in a change of the dynamic stall classification of the airfoil response under various unsteady flow conditions. These conditions are discussed in detail in the comparative studies.
Author | : K. W. McAlister |
Publisher | : |
Total Pages | : 80 |
Release | : 1993 |
Genre | : Aerofoils |
ISBN | : |
Download Suppression of Dynamic Stall with a Leading-edge Slat on a VR-7 Airfoil Book in PDF, ePub and Kindle
Author | : Bruce E. Brydges |
Publisher | : |
Total Pages | : 116 |
Release | : 1989 |
Genre | : |
ISBN | : |
Download Flow Visualization of Dynamic Stall on an Oscillating Airfoil Book in PDF, ePub and Kindle
Stroboscopic schlieren photography was used to investigate the effects of compressibility, reduced frequency, and amplitude on the dynamic stall of a NACA 0012 airfoil subjected to sinusoidal oscillation. The Mach number was varied from M at infinity = 0.25 to M at infinity = 0.45 (corresponding to a Reynolds number variation of Re = 450,000 to Re = 810,000); the reduced frequency was varied from k = 0.025 to k = 0.10. Oscillation amplitudes of alpha sub m = 5 deg and alpha sub m = 10 deg were compared. Schlieren photographs are presented, which document the dynamic stall vortex formation, convection, and shedding sequence for various experimental conditions. Additionally, a preliminary examination of the flow reattachment process was conducted. Data derived from the photographs indicates that increasing the compressibility causes dynamic stall to occur at lower angles of attack; while, increasing the reduced frequency and/or the oscillation amplitude effectively delays dynamic stall effects to a higher angle of attack. Flow reattachment is sensitive to both Mach number and reduced frequency for low values of these parameters; when either the Mach number or reduced frequency is sufficiently high, the reattachment process stabilizes. Keywords: Dynamic stall; Dynamic lift; Unsteady lift; Helicopter retreating blade stall; Oscillating airfoil; Flow visualization; Schlieren method. Theses. (jhd).
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 1989 |
Genre | : |
ISBN | : |
Download Flow Visualization of Dynamic Stall on an Oscillating Airfoil Book in PDF, ePub and Kindle
Stroboscopic schlieren photography was used to investigate the effects of compressibility, reduced frequency, and amplitude on the dynamic stall of a NACA 0012 airfoil subjected to sinusoidal oscillation. The Mach number was varied from M at infinity = 0.25 to M at infinity = 0.45 (corresponding to a Reynolds number variation of Re = 450,000 to Re = 810,000); the reduced frequency was varied from k = 0.025 to k = 0.10. Oscillation amplitudes of alpha sub m = 5 deg and alpha sub m = 10 deg were compared. Schlieren photographs are presented, which document the dynamic stall vortex formation, convection, and shedding sequence for various experimental conditions. Additionally, a preliminary examination of the flow reattachment process was conducted. Data derived from the photographs indicates that increasing the compressibility causes dynamic stall to occur at lower angles of attack; while, increasing the reduced frequency and/or the oscillation amplitude effectively delays dynamic stall effects to a higher angle of attack. Flow reattachment is sensitive to both Mach number and reduced frequency for low values of these parameters; when either the Mach number or reduced frequency is sufficiently high, the reattachment process stabilizes. Keywords: Dynamic stall; Dynamic lift; Unsteady lift; Helicopter retreating blade stall; Oscillating airfoil; Flow visualization; Schlieren method. Theses. (jhd).
Author | : R. D. VanDyken |
Publisher | : |
Total Pages | : |
Release | : 1992 |
Genre | : |
ISBN | : |
Download Leading Edge Velocity Field of an Oscillating Airfoil in Compressible Dynamic Stall Book in PDF, ePub and Kindle
Author | : M. S. Chandrasekhara |
Publisher | : |
Total Pages | : |
Release | : 1990 |
Genre | : |
ISBN | : |
Download Amplitude Effects on Dynamic Stall of an Oscillating Airfoil Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : |
Release | : |
Genre | : |
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Download Rush, Olive Book in PDF, ePub and Kindle
The folder may include clippings, announcements, small exhibition catalogs, and other ephemeral items.
Author | : S. Ahmed |
Publisher | : |
Total Pages | : |
Release | : 1991 |
Genre | : |
ISBN | : |
Download Reattachment Studies of an Oscillating Airfoil Dynamic Stall Flow Field Book in PDF, ePub and Kindle