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Flow Visualization Of Dynamic Stall On An Oscillating Airfoil
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Book Synopsis Flow Visualization of Dynamic Stall on an Oscillating Airfoil by : Bruce E. Brydges
Download or read book Flow Visualization of Dynamic Stall on an Oscillating Airfoil written by Bruce E. Brydges and published by . This book was released on 1989 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Flow Visualization of Dynamic Stall on an Oscillating Airfoil by :
Download or read book Flow Visualization of Dynamic Stall on an Oscillating Airfoil written by and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Analysis of the Development of Dynamic Stall Based on Oscillating Airfoil Experiments by : Lawrence W. Carr
Download or read book Analysis of the Development of Dynamic Stall Based on Oscillating Airfoil Experiments written by Lawrence W. Carr and published by . This book was released on 1977 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Visualization Studies of the Mach Number Effects on the Dynamic Stall of an Oscillating Airfoil by : M. Chandrasekhara
Download or read book Flow Visualization Studies of the Mach Number Effects on the Dynamic Stall of an Oscillating Airfoil written by M. Chandrasekhara and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Visualization of Dynamic Stall on a Pitching Airfoil by : K.F. Tchon
Download or read book Flow Visualization of Dynamic Stall on a Pitching Airfoil written by K.F. Tchon and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Oscillating Airfoil in Compressible Flow by : Herschel Weil
Download or read book The Oscillating Airfoil in Compressible Flow written by Herschel Weil and published by . This book was released on 1948 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reattachment Studies of an Oscillating Airfoil Dynamic Stall Flow Field by : S. Ahmed
Download or read book Reattachment Studies of an Oscillating Airfoil Dynamic Stall Flow Field written by S. Ahmed and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Stall on Airfoils in Oscillating Flow by : John Joseph Zolan
Download or read book Dynamic Stall on Airfoils in Oscillating Flow written by John Joseph Zolan and published by . This book was released on 1976 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Aerodynamics of Airfoil Oscillating in and Out of Dynamic Stall by : C. M. Wang
Download or read book Unsteady Aerodynamics of Airfoil Oscillating in and Out of Dynamic Stall written by C. M. Wang and published by . This book was released on 1985 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solution procedure is presented for the computation of dynamic stall phenomena encountered by arbitrary shaped airfoils under arbitrary flow conditions. This procedure solves the unsteady, incompressible Navier-Stokes and the unsteady boundary layer equations using an efficient, zonal approach. A number of results for a modified NACA 0012 airfoil experiencing dynamic stall are presented and compared with available numerical data. Qualitative comparisons with flow visualization experiments are also presented. (Author).
Book Synopsis PIV-based Examination of Dynamic Stall on an Oscillating Airfoil by : Daniel E. Fredberg
Download or read book PIV-based Examination of Dynamic Stall on an Oscillating Airfoil written by Daniel E. Fredberg and published by . This book was released on 2008 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Motion History on Leading Edge Separation for an Airfoil Pitching to Large Angles of Attack by : Todd Allen Brown
Download or read book Effects of Motion History on Leading Edge Separation for an Airfoil Pitching to Large Angles of Attack written by Todd Allen Brown and published by . This book was released on 1992 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Dynamic Stall on Advanced Airfoil Sections. Volume 1: Summary of the Experiment by :
Download or read book An Experimental Study of Dynamic Stall on Advanced Airfoil Sections. Volume 1: Summary of the Experiment written by and published by . This book was released on 1982 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The static and dynamic characteristics of seven helicopter sections and a fixed-wing supercritical airfoil were investigated over a wide range of nominally two-dimensional flow conditions, at Mach numbers up to 0.30 and Reynolds numbers up to 4x10 to the 6th power. Details of the experiment, estimates of measurement accuracy, and test conditions are described in this volume. The results of the experiment show important differences between airfoils, which would otherwise tend to be masked by differences in wind tunnels, particularly in steady cases. All of the airfoils tested provide significant advantages over the conventional NACA 0012 profile. In general, however, the parameters of the unsteady motion appear to be more important than airfoil shape in determining the dynamic-stall airloads.
Book Synopsis Unsteady Separated Flows by : Marvin Luttges
Download or read book Unsteady Separated Flows written by Marvin Luttges and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Water-tunnel Experiments on an Oscillating Airfoil at RE by : Kenneth W. McAlister
Download or read book Water-tunnel Experiments on an Oscillating Airfoil at RE written by Kenneth W. McAlister and published by . This book was released on 1978 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722792268 Total Pages :76 pages Book Rating :4.7/5 (922 download)
Book Synopsis Suppression of Dynamic Stall with a Leading-Edge Slat on a Vr-7 Airfoil by : National Aeronautics and Space Administration (NASA)
Download or read book Suppression of Dynamic Stall with a Leading-Edge Slat on a Vr-7 Airfoil written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-16 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The VR-7 airfoil was experimentally studied with and without a leading-edge slat at fixed angles of attack from 0 deg to 30 deg at Re = 200,000 and for unsteady pitching motions described by alpha equals alpha(sub m) + 10 deg(sin(wt)). The models were two dimensional, and the test was performed in a water tunnel at Ames Research Center. The unsteady conditions ranged over Re equals 100,000 to 250,000, k equals 0.001 to 0.2, and alpha(sub m) = 10 deg to 20 deg. Unsteady lift, drag, and pitching-moment measurements were obtained along with fluorescent-dye flow visualizations. The addition of the slat was found to delay the static-drag and static-moment stall by about 5 degrees and to eliminate completely the development of a dynamic-stall vortex during unsteady motions that reached angles as high as 25 degrees. In all of the unsteady cases studied, the slat caused a significant reduction in the force and moment hysteresis amplitudes. The reduced frequency was found to have the greatest effect on the results, whereas the Reynolds number had little effect on the behavior of either the basic or the slatted airfoil. The slat caused a slight drag penalty at low angles of attack, but generally increased the lift/drag ratio when averaged over the full cycle of oscillation. Mcalister, K. W. and Tung, C. Ames Research Center...
Book Synopsis A Computational and Experimental Investigation of the Propulsive and Lifting Characteristics of Oscillating Airfoils and Airfoil Combinations in Incompressible Flow by : Kerry S. Neace
Download or read book A Computational and Experimental Investigation of the Propulsive and Lifting Characteristics of Oscillating Airfoils and Airfoil Combinations in Incompressible Flow written by Kerry S. Neace and published by . This book was released on 1992 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Amplitude Effects on Dynamic Stall of an Oscillating Airfoil by : M. S. Chandrasekhara
Download or read book Amplitude Effects on Dynamic Stall of an Oscillating Airfoil written by M. S. Chandrasekhara and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
