Standard: LC - NASA - NACA TN 3400

ANALYSIS OF ERRORS INTRODUCED BY SEVERAL METHODS OF WEIGHTING NONUNIFORM DUCT FLOWS

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Scope:

Various weighting methods are applied to typical nonuniform duct flow profiles to determine average flow properties. The analysis covers a range of subsonic duct Mach numbers, but is confined to flows having uniform static pressure and total temperature.

An averaging method is developed which yields uniform properties that reproduce the mass and momentum of the nonuniform flow. In contrast, it is shown that the use of conventional weighting methods may result in large errors in these properties. These errors are shown to have varying significance depending on the applications to which the data are applied.

It is also shown that nonuniform flows through variable-area duct passages will cause changes in average flow properties that are not associated with the real thermodynamic flow path.

Organization: National Aeronautics and Space Administration (NASA)
Document Number: naca tn 3400
Publish Date: 1955-01-01
Page Count: 41
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active
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