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An experimental investigation of boundary layer transition in an adverse pressure gradientThe evolution of a small perturbation introduced periodically into a boundary layer with a moderately strong adverse pressure gradient (APG) was investigated experimentally using the hot-wire method. The magnitude of the disturbance is found to decay with the streamwise distance in the APG before undergoing rapid growth and triggering transition in a very repetitive manner. The evidence suggests that the laminar layer separates and that the transition mechanism is an inviscid shear-layer type of instability. Contours of spanwise vorticity in the plane of the disturbance show the formation of roll-ups in the initial stages. Subsequent interaction with the wall leads to the formation of large-scale vortex loops which merge into a single vortex loop further downstream.
Document ID
19920053395
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Watmuff, Jonathan H.
(NASA Ames Research Center; MCAT Institute Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: ASME and JSME Joint Fluids Engineering Conference
Location: Portland, OR
Country: United States
Start Date: June 23, 1991
End Date: June 27, 1991
Accession Number
92A36019
Distribution Limits
Public
Copyright
Other

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