Abstract
The objective of this research is to gain new information about a fundamental turbulent planar free shear layer through use of a recently developed diagnostic technique: cinematic Particle Image Velocimetry (PIV). This is accomplished with an argonion laser, a scanning mirror and a 35 mm movie camera. The water shear layer under investigation has a velocity ratio of 0. 22 and a Reynolds number based on velocity thickness and AU of 28, 000. The experimental data obtained by cinematic PIV yields a combined spatial and temporal evolution of the two-dimensional shear layer velocity and spanwise vorticity fields. A simple optimization of the experimental parameters was completed to allow maximum resolution with minimum uncertainty levels. The detailed structure of the shear layer was very different from previous low Reynolds number flows in that the classical well defined eddies and braids were replaced with complex three-dimensional agglomerated vortices of both signs. The velocity field evolution was also notably different from that of the passive scalar field, where the former exhibited stronger temporal variations and reduced spatial coherency. Preliminary temporal and spatial correlations also reveal transverse distributions of integral scales and convection velocities based on streamwise velocity perturbations.
| Original language | English (US) |
|---|---|
| Title of host publication | AIAA Fluid Dynamics Conference, 1994 |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| State | Published - 1994 |
| Externally published | Yes |
| Event | AIAA Fluid Dynamics Conference, 1994 - Colorado Springs, United States Duration: Jun 20 1994 → Jun 23 1994 |
Other
| Other | AIAA Fluid Dynamics Conference, 1994 |
|---|---|
| Country/Territory | United States |
| City | Colorado Springs |
| Period | 6/20/94 → 6/23/94 |
ASJC Scopus subject areas
- Aerospace Engineering
- Engineering (miscellaneous)