Identification of the viscous superlayer on the low speed side of a single stream shear layer
Image pairs (elevation/plan views) have been acquired of a smoke streakline originating in the irrotational region on the low-speed side of the high Re single-stream shear layer of Morris and Foss (2003a). The viscous superlayer (VSL) is identified as the terminus of the streak; 1800 such images provide VSL position statistics. Hot-wire data acquired concurrently at the shear layer edge and interior are used to investigate the relationship between these velocity magnitudes and the large-scale motions. Distinctive features (plumes) along the streakline are tracked between images to provide discrete irrotational region velocity magnitudes and material trajectories. A non-diffusive marker, introduced in the separating (high speed) boundary layer and imaged at x/θo = 351.6, has revealed an unexpected bias in the streak-defined VSL locations. The interpretation of this bias clarifies the induced flow patterns in the entrainment region. The observations are consistent with a conception of the large-scale shear layer motions as "billows" of vortical fluid separated by re-entrant "wedges" of irrotational fluid, per Phillips (1972).
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- In Collections
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Electronic Theses & Dissertations
- Copyright Status
- In Copyright
- Material Type
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Theses
- Authors
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Peabody, Jason Anthony
- Thesis Advisors
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Foss, John F.
- Committee Members
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Koochesfahani, Manoochechr M.
Naguib, Ahmed M.
- Date
- 2010
- Program of Study
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Mechanical Engineering
- Degree Level
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Masters
- Language
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English
- Pages
- xii, 130 pages
- ISBN
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9781124382432
1124382437
- Permalink
- https://doi.org/doi:10.25335/xa43-se96