Presentation
Experimental Study on Unsteady Flows and Multiple Near-wake Patterns Behind Slotted Disks
14th AIAA Aerodynamic Decelerator Systems Technology Conference
(1997)
Abstract
The effect of spacing ratio on the near-wake regions behind porous disks that consist of multiple annular elements was experimentally investigated. Annular jets through individual slots merged into groups of positive momentum regions which displaced a global recirculating region downstream. Multiple wake patterns resulted from the same overall conditions, but once the pattern formed, it remained nearly unchanged unless the flow was disturbed. Compared to the flow behind a solid disk, three-dimensional large scale motions were suppressed downstream and the wake motions were more axisymmetric. The patterns of jet mergings were also axisymmetric and persistent. The mean velocity and time dependent large and small-scale velocity fluctuations at different spacing ratios and flow patterns were analyzed and compared with flow visualizations.
Keywords
- Unsteady Flows,
- Kelvin Helmholtz Instability,
- Starting Vortex,
- Shear Layers,
- Power Spectral Density,
- Free Stream Velocity,
- Velocity Profiles,
- Radial Velocity,
- Energy Distribution,
- Laser Doppler Velocimetry
Disciplines
Publication Date
June, 1997
Location
San Francisco, United States
DOI
10.2514/6.1997-1480
Citation Information
Hiroshi Higuchi, Jinzhong Zhang, Brian Muzas and Shojiro Furuya. "Experimental Study on Unsteady Flows and Multiple Near-wake Patterns Behind Slotted Disks" 14th AIAA Aerodynamic Decelerator Systems Technology Conference (1997) Available at: http://works.bepress.com/brian-muzas/11/