Accession Number : ADA317667

Title :   Dynamical Effects of Delta Wing Actuators on Streamwise Vortices in Boundary Layers.

Descriptive Note : Final rept. 1 Nov 94-30 Jun 96,

Corporate Author : CALIFORNIA UNIV LOS ANGELES

Personal Author(s) : Blackwelder, Ron F.

PDF Url : ADA317667

Report Date : 07 NOV 1996

Pagination or Media Count : 3

Abstract : Small delta wing actuators have been constructed and employed in a turbulent boundary layer to provide a disturbance in the wall region. The actuators oscillate perpendicular to the wall with small amplitudes of a few viscous scales. The oscillations set up a spanwise flow of low speed fluid near the wall that coagulates into low speed regions. Since other investigators have found that a spanwise flow near the wall can reduce the drag on the bounding surface, these actuators may be a convenient method to introduce such a spanwise velocity in the near wall region.

Descriptors :   *TURBULENCE, *TURBULENT BOUNDARY LAYER, VORTICES, WIND TUNNEL TESTS, ACTUATORS, FREE STREAM, DELTA WINGS.

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE