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SAE AIR 1168/1A:2019-04-11
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Thermodynamics of Incompressible and Compressible Fluid Flow
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The fluid flow treated in this section is isothermal, subsonic, and incompressible. The effects of heat addition, work on the fluid, variation in sonic velocity, and changes in elevation are neglected. An incompressible fluid is one in which a change in pressure causes no resulting change in fluid density. The assumption that liquids are incompressible introduces no appreciable error in calculations, but the assumption that a gas is incompressible introduces an error of a magnitude that is dependent on the fluid velocity and on the loss coefficient of the particular duct section or piece of equipment. Fig. 1A-1 shows the error in pressure drop resulting from assuming that air is incompressible.
| Author | SAE |
|---|---|
| Editor | SAE |
| Document type | Standard |
| Format | File |
| ICS | 49.080 : Aerospace fluid systems and components
|
| Number of pages | 156 |
| Replace | SAE AIR 1168/1:2011-06-20 |
| Year | 2019 |
| Document history | SAE AIR 1168/1:2011-06-20 |
| Country | USA |
| Keyword | SAE 11681;SAE AIR1168/1A;SAE AIR1168/1A;SAE AIR 1168/1 |