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Photographic Evidence of Streamwise Arrays of Vortices in Boundary-Layer FlowPhotographs are presented of various models coated with fluorescent oil to show evidence of surface vortices at a Mach number of 3.03. Vortex formation was evidently present on models with forward-facing steps, rearward-facing steps, wires, discrete surface particles, or unswept flat surfaces with sharp leading edges. Some photographs are also presented for the models coated with a sublimation material which clearly indicates the location of boundary-layer transition; however, it does not show the vortices as clearly as the fluorescent oil. The study was made on the models at an angle of attack of 0 deg at unit Reynolds numbers of 7.7 and 10.7 million per foot. The spacing of the vortices as indicated by the flow studies on the unswept model was smaller at the higher Reynolds number in accordance with Gortler's theory. The flow studies also indicated that stable surface vortices produced by either steps or surface roughness persisted over model areas known to have turbulent boundary layers.
Document ID
19980228352
Acquisition Source
Headquarters
Document Type
Other - NASA Technical Note (TN)
Authors
Hopkins, Edward J. (NASA Ames Research Center Moffett Field, CA United States)
Keating, Stephen J., Jr. (NASA Ames Research Center Moffett Field, CA United States)
Bandettini, Angelo (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1960
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TN-D-328
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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