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NACA-TN-3400
Analysis of errors introduced by several methods of weighting nonuniform duct flows
Year: 1955
Abstract: 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.
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.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:21:54Z | |
| date available | 2017-09-04T17:21:54Z | |
| date copyright | 01/01/1955 | |
| date issued | 1955 | |
| identifier other | ZUNUYDAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/145128 | |
| description abstract | 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. | |
| language | English | |
| title | NACA-TN-3400 | num |
| title | Analysis of errors introduced by several methods of weighting nonuniform duct flows | en |
| type | standard | |
| page | 41 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1955 | |
| contenttype | fulltext |