NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The effect of finite turbulence spatial scale on the amplification of turbulence by a contracting streamThe turbulence downstream of a rapid contraction is calculated for the case when the turbulence scale can have the same magnitude as the mean-flow spatial scale. The approach used is based on the formulation of Goldstein (1978) for turbulence downstream of a contraction, with the added assumptions of a parallel mean flow at downstream infinity and turbulence calculated far enough downstream so that the nonuniformity of the mean flow field has decayed, and by treating the inverse contraction ratio as a small parameter. Consideration is given to the large-contraction-ratio and classical rapid-distortion theory limits, and to results at an arbitrary contraction ratio. It is shown that the amplification effect of the contraction is reduced when the spatial scale of the turbulence increases, with the upstream turbulence actually suppressed for a contraction ratio less than five and a turbulence spatial scale greater than three times the transverse dimensions of the downstream channel.
Document ID
19800060692
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goldstein, M. E.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Durbin, P. A.
(Cambridge University Cambridge, United Kingdom)
Date Acquired
August 10, 2013
Publication Date
June 12, 1980
Publication Information
Publication: Journal of Fluid Mechanics
Volume: 98
Subject Category
Aerodynamics
Accession Number
80A44862
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available