Accession Number:

ADP005895

Title:

Three-Dimensional Flow Visualization Using Laser-Sheet Scanning,

Descriptive Note:

Corporate Author:

PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

1987-06-01

Pagination or Media Count:

14.0

Abstract:

It has been demonstrated that the conventional technique of fixed-laser-sheet flow visualization can be extended to include three-dimensional visualization by means of a scanning laser sheet. This system was implemented using a rotating mirror in conjunction with appropriate fixed optics. A space-filling three-dimensional data base was digitally obtained from the imaging and recording units, and was processed to yield a variety of three dimensional views of the flow field in addition to obtaining quantitative results regarding mixing levels and velocities. Laser-sheet scanning was first applied in a study of boundary-layer turbulence in which active control was implemented. The flow visualization readily indicated the near-wall instabilities present in turbulent spots and synthetic turbulent boundary-layers. When control was attempted using an array of surface heating elements, the visualization technique graphically illustrated the attenuation of the near-wall sublayer streaks and resultant quiescent outer flow.

Subject Categories:

  • Fluid Mechanics
  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE