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Air Flow in the Boundary Layer of an Elliptic CylinderThe boundary layer of an elliptic cylinder of major and minor axis 11.78 and 3.98 inches, respectively, was investigated in air stream in which the turbulence could be varied. Conditions were arranged so that the flow was two-dimensional with the major axis of the ellipse parallel to the undisturbed stream. Speed distributions across the boundary layer were determined with a hot-wire anemometer at a number of positions about the surface for the lowest and highest intensities of turbulence, with the air speed in both cases sufficiently high to produce a turbulent boundary layer over the downstream part of the surface. The magnitude and the frequency of the speed fluctuations in the boundary layer were also measured by the use of the conventional type of hot-wire turbulence apparatus. Stream turbulence was found to affect both the nature of transition from laminar to turbulent flow in the layer and the position on the surface at which transition occurred. Transition was then investigated in detail with stream turbulence of several different scales and intensities.
Document ID
19930091727
Document Type
Other
Authors
Schubauer, G B
Date Acquired
September 6, 2013
Publication Date
January 1, 1939
Report/Patent Number
NACA-TR-652
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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