SAE AIR1168/1-1990
Thermodynamics of Incompressible and Compressible Fluid Flow

Standard No.

SAE AIR1168/1-1990

Release Date

1990

Published By

Society of Automotive Engineers (SAE)

Status

Be replaced

Replace By

SAE AIR1168/1-1990(R2004)

Latest

SAE AIR1168/1A-2019

Scope

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 price of equipment. With reasonably small loss coefficients and the accuracy that is usually required in most calculations, compressible fluids may be treated as incompressible for velocities less than Mach 0.2. At higher velocities and for large loss coefficients (Kt and 4fL/D), compressible flow analysis should be used.

SAE AIR1168/1-1990 history

• 2019 SAE AIR1168/1A-2019 Thermodynamics of Incompressible and Compressible Fluid Flow
• 2011 SAE AIR1168/1-2011 Thermodynamics of Incompressible and Compressible Fluid Flow
• 0000 SAE AIR1168/1-1990(R2004)
• 1990 SAE AIR1168/1-1990 Thermodynamics of Incompressible and Compressible Fluid Flow
• 1989 SAE AIR1168/1-1989 Thermodynamics of Incompressible and Compressible Fluid Flow

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