Three-Dimensional Flow Visualization Using Laser-Sheet Scanning,
PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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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.
- Fluid Mechanics
- Lasers and Masers