Access the full text.
Sign up today, get DeepDyve free for 14 days.
B. Wieneke (2005)
Stereo-PIV using self-calibration on particle imagesExperiments in Fluids, 39
M Lang, U Rist, S Wagner (2004)
Investigations on disturbance amplification in a laminar separation bubble by means of LDA and PIVExp Fluids, 36
M. Gad-el-Hak (2001)
Micro-Air-Vehicles: Can They be Controlled Better?Journal of Aircraft, 38
J. Watmuff (1999)
Evolution of a wave packet into vortex loops in a laminar separation bubbleJournal of Fluid Mechanics, 397
W. Roberts (1979)
Calculation of Laminar Separation Bubbles and Their Effect on Airfoil PerformanceAIAA Journal, 18
E. Malkiel, R. Mayle (1995)
Transition in a Separation BubbleJournal of Turbomachinery-transactions of The Asme, 118
Richard Keane, R. Adrian (1990)
Optimization of particle image velocimeters. I, Double pulsed systemsMeasurement Science and Technology, 1
M. Selig (1995)
Summary of low speed airfoil data
M. Lang, U. Rist, S. Wagner (2004)
Investigations on controlled transition development in a laminar separation bubble by means of LDA and PIVExperiments in Fluids, 36
R. Tsai (1986)
An Efficient and Accurate Camera Calibration Technique for 3D Machine Vision
Jinhee Jeong, F. Hussain (1995)
On the identification of a vortexJournal of Fluid Mechanics, 285
Zhiyin Yang, P. Voke (2001)
Large-eddy simulation of boundary-layer separation and transition at a change of surface curvatureJournal of Fluid Mechanics, 439
C. Brücker (1992)
Study of vortex breakdown by particle tracking velocimetry (PTV)Experiments in Fluids, 14
L. Pauley, P. Moin, W. Reynolds (1990)
The structure of two-dimensional separationJournal of Fluid Mechanics, 220
M Gaster (1966)
The structure and behaviour of laminar separation bubblesAGARD CP-4, Flow sep, Part 2
R. Volino, L. Hultgren (2000)
Measurements in Separated and Transitional Boundary Layers Under Low-Pressure Turbine Airfoil ConditionsJournal of Turbomachinery-transactions of The Asme, 123
C. Brücker (1995)
Digital-Particle-Image-Velocimetry (DPIV) in a scanning light-sheet: 3D starting flow around a short cylinderExperiments in Fluids, 19
M. O’Meara, T. Mueller (1987)
Laminar separation bubble characteristics on an airfoil at low Reynolds numbersAIAA Journal, 25
RY Tsai (1986)
An efficient and accurate camera calibration technique for 3D machine vision, proceedings of IEEE conference on computer vision and pattern recognitionMiami Beach, 1986
S. Burgmann, C. Brücker, W. Schröder (2006)
Scanning PIV measurements of a laminar separation bubbleExperiments in Fluids, 41
W. Yuan, M. Khalid, Jan Windte, U. Scholz, R. Radespiel (2005)
An Investigation of Low-Reynolds-number Flows past Airfoils
M. Ol, Brian McCauliffe, E. Hanff, U. Scholz, C. Kaehler (2005)
Comparison of Laminar Separation Bubble Measurements on a Low Reynolds Number Airfoil in Three Facilities
Ajay Prasad, Kirk Jensen (1995)
Scheimpflug stereocamera for particle image velocimetry in liquid flows.Applied optics, 34 30
B. McAuliffe, M. Yaras (2005)
Separation-Bubble-Transition Measurements on a Low-Re Airfoil Using Particle Image Velocimetry
E. Fitzgerald, T. Mueller (1990)
Measurements in a separation bubble on an airfoil using laser velocimetryAIAA Journal, 28
To comprehensively understand the effects of Kelvin–Helmholtz instabilities on a transitional separation bubble on the suction side of an airfoil regarding as to flapping of the bubble and its impact on the airfoil performance, the temporal and spatial structure of the vortices occurring at the downstream end of the separation bubble is investigated. Since the bubble variation leads to a change of the pressure distribution, the investigation of the instantaneous velocity field is essential to understand the details of the overall airfoil performance. This vortex formation in the reattachment region on the upper surface of an SD7003 airfoil is analyzed in detail at different angles of attack. At a Reynolds number Re c < 100,000 the laminar boundary layer separates at angles of attack >4°. Due to transition processes, turbulent reattachment of the separated shear layer occurs enclosing a locally confined recirculation region. To identify the location of the separation bubble and to describe the dynamics of the reattachment, a time-resolved PIV measurement in a single light-sheet is performed. To elucidate the spatial structure of the flow patterns in the reattachment region in time and space, a stereo scanning PIV set-up is applied. The flow field is recorded in at least ten successive light-sheet planes with two high-speed cameras enclosing a viewing angle of 65° to detect all three velocity components within a light-sheet leading to a time-resolved volumetric measurement due to a high scanning speed. The measurements evidence the development of quasi-periodic vortex structures. The temporal dynamics of the vortex roll-up, initialized by the Kelvin–Helmholtz (KH) instability, is shown as well as the spatial development of the vortex roll-up process. Based on these measurements a model for the evolving vortex structure consisting of the formation of c-shape vortices and their transformation into screwdriver vortices is introduced.
Experiments in Fluids – Springer Journals
Published: Nov 4, 2007
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.