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

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 07, 1996
Accession Number
ADA317667

Entities

People

  • Ron F. Blackwelder

Organizations

  • University of California, Los Angeles

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Actuators
  • Amplitude
  • Boundaries
  • Boundary Layer
  • Delta Wings
  • Flow
  • Fluid Flow
  • Free Stream
  • Hypervelocity Flow
  • Layers
  • Oscillation
  • Shear Flow
  • Stainless Steel
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.