Laser-Doppler velocimetry is employed to measure the periodic field created by releasing spanwise vortices in a turbulent boundary layer. Phase-averaged vorticity and turbulence level contours are estimated and presented. It is found that vortices with diameter of the order of the boundary layer quickly diffuse and disappear while their turbulent kinetic energy spreads uniformly across the entire boundary layer. Larger vortices have a considerably longer life span and in turn feed more vorticity into the boundary layer.
Issue Section:
Research Papers
1.
Booth
E. R.
Yu
Y. C.
1986
, “Two-Dimensional Blade-Vortex Visualization Investigation
,” AIAA Journal
, Vol. 24
, pp. 1468
–1473
.2.
Booth, E. R., 1986, “Surface Pressure Measurement During Low Speed Two-Dimensional Blade-Vortex Interaction,” AIAA Paper No. 86-1856.
3.
Consigny
H.
Gravelle
A.
Molinaro
R.
1984
, “Aerodynamic Characteristics of a Two-Dimensional Moving Spoiler in Subsonic and Transonic Flow
,” Journal of Aircraft
, Vol. 21
, pp. 687
–693
.4.
Francis
M. S.
Keesee
J. E.
Lang
J. D.
Sparks
G. W.
Sisson
G. E.
1979
, “Aerodynamic Characteristics of an Unsteady Separated Flow
,” AIAA Journal
, Vol. 17
, pp. 1332
–1339
.5.
Kida
S.
Takaoka
M.
Hussain
F.
1991
, “Collision of Two Vortex Rings
,” Journal of Fluid Mechanics
, Vol. 230
, pp. 583
–646
.6.
Kida
S.
Takaoka
M.
1994
, “Vortex Reconnection
,” Annual Reviews of Fluid Mechanics
, Vol. 25
, pp. 169
–189
.7.
Kothmann, B. C., and Pauley, W. P., 1992, “Interaction of Unsteady Turbulent, Vortical Structures with a Turbulent Boundary Layer,” AIAA Paper No. 92-0060.
8.
Koromilas
C.
Telionis
D. P.
1980
, “Unsteady Laminar Separation—An Experimental Study
,” Journal of Fluid Mechanics
, Vol. 97
, pp. 347
–384
.9.
Littell
H. S.
Eaton
J. K.
1991
, “Unsteady Flowfield Behind a Vortex Generator Rapidly Pitched to Angle of Attack
,” AIAA Journal
, Vol. 29
, pp. 577
–584
.10.
Macrorie, M., and Pauley, W. R., 1992, “Experimental Development of Spanwise Vortex Models with Streamwise Decay Due to Wall Interaction,” AIAA Paper 92-2688.
11.
Makita
H.
K. Sassa
M.
Itabashi
A.
1989
, “Decay Processor of a Manipulated Large-Scale Horseshoe Vortex in a Turbulent Boundary Layer
,” AIAA Journal
, Vol. 27
, pp. 155
–160
.12.
Mathioulakis
D. S.
Telionis
D. P.
1987
, “Velocity and Vorticity Distribution in Periodic Separating Flow
,” Journal of Fluid Mechanics
, Vol. 184
, pp. 303
–333
.13.
Morton
B. R.
1984
, “The Generation and Decay of Vorticity
,” GeophysicoAstrophysics Fluid Dynamics
, Vol. 28
, pp. 277
–308
.14.
Nagib, H. M., Reisenthel, P. H., and Koga, D. J., 1985, “On the Dynamical Scaling of Forced Unsteady Flows,” AIAA Paper No. 85-0553.
15.
Nelson
C. F.
Koga
D. J.
Eaton
J. K.
1990
, “Unsteady, Separated Flow Behind an Oscillating, Two-Dimensional Spoiler
,” AIAA Journal
, Vol. 28
, pp. 845
–852
.16.
Poling
D. R.
Telionis
D. P.
1986
, “The Response of Airfoils to Periodic Disturbances—The Unsteady Kutta Condition
,” AIAA Journal
, Vol. 24
, pp. 193
–199
.17.
Poling, D. R., Wilder, M. C., and Telionis, D. P., 1988, “Two-Dimensional Interaction of Vortices with a Blade,” AIAA Paper No. 88-0044.
18.
Reisenthel, P. H., Nagib, H. M., and Koga, D. J., 1985, “Control of Separated Flows Using Forced Unsteadiness,” AIAA Paper No. 85-0556.
19.
Shabaka
I. M. M. A.
Mehta
R. D.
Bradshaw
P.
1985
, “Longitudinal Vortices Imbedded in Turbulent Boundary Layers, Part 1, Single Vortex
,” Journal of Fluid Mechanics
, Vol. 155
, pp. 37
–57
.20.
Wilder, M. C., Pesce, M. M., Telionis, D. P., Poling, D. R., and Dadone, L., 1990, “Blade-Vortex Interaction Experiments—Velocity and Vorticity Fields,” AIAA Paper No. 90-0030.
21.
White, F. M., 1974, Viscous Fluid Flow, McGraw-Hill, 2nd Edition, New York.
This content is only available via PDF.
Copyright © 1995
by The American Society of Mechanical Engineers
You do not currently have access to this content.
