Accession Number : ADP005895

Title :   Three-Dimensional Flow Visualization Using Laser-Sheet Scanning,

Corporate Author : PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Nosenchuck, D. M. ; Lynch, M. K.

Report Date : JUN 1987

Pagination or Media Count : 14

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.

Descriptors :   *FLOW VISUALIZATION, THREE DIMENSIONAL, SCANNING, LASER INDUCED FLUORESCENCE, MIRRORS, ROTATION, FLOW FIELDS, OPTICAL DATA, DATA PROCESSING, WALLS, HEATING, TURBULENT BOUNDARY LAYER, ATTENUATION.

Subject Categories : Fluid Mechanics
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE