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Effect of geometrical and flow parameters on high-effectiveness region of film coolingPrevious analyses for an inviscid jet injected into a stream and the turbulent mixing region which forms between jet and stream are used to find the extent of the core region in a cooling film by calculating the growth of the turbulent boundary layer on the downstream wall. The core is a region of nearly perfect effectiveness which ends at the intersection of the boundary layer and the mixing region. The calculations show that the most important geometrical factor bearing on the length of the core is the curvature of the wall. When the radius of curvature is large, the boundary layer remains thin and the core is long. The effects of Reynolds number, total-pressure difference between film and stream, and lateral position of the downstream wall are also investigated. The step configuration is shown to have a longer core than the slot for the same flow conditions.
Document ID
19740012483
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Braum, W. H. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
April 1, 1974
Subject Category
Thermodynamics And Combustion
Report/Patent Number
NASA-TN-D-7636
E-7538
Accession Number
74N20596
Funding Number(s)
PROJECT: RTOP 502-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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