Article
Immediate and Near Wake Flow Patterns Behind Slotted Disks
AIAA Journal
(1998)
Abstract
The effect of spacing ratio on the near-wake regions immediately behind porous disks that consisted of multiple annular elements is investigated experimentally. Annular jets through individual slots merge into groups of high-momentum regions that displace a global recirculating region downstream. Multiple wake patterns result from the same overall conditions. Once the pattern forms, it remains nearly unchanged unless the flow is disturbed. Compared to the how behind a solid disk, three-dimensional large-scale motions are suppressed downstream and the wake motions are more axisymmetric. The patterns of jet mergings are also axisymmetric and persistent. The mean and time-dependent large- and small-scale velocity fluctuations are characteristic of individual spacing ratios and flow patterns, and they are analyzed and compared with how visualizations. The process of how the wake settles into a certain flow pattern also is addressed.
Keywords
- Flow Patterns,
- Vortex Structure,
- Shear Layers,
- Power Spectral Density,
- Kelvin Helmholtz Instability,
- Freestream Velocity,
- Radial Velocity,
- Particle Image Velocimetry,
- Energy Distribution,
- Freestream Turbulence
Disciplines
Publication Date
September, 1998
DOI
10.2514/2.564
Citation Information
Hiroshi Higuchi, Jinzhong Zhang, Shojiro Furuya and Brian Muzas. "Immediate and Near Wake Flow Patterns Behind Slotted Disks" AIAA Journal Vol. 36 Iss. 9 (1998) p. 1626 - 1634 ISSN: 0001-1452 Available at: http://works.bepress.com/brian-muzas/10/