Historical

SAE AIR1168/1

Name: SAE AIR1168/1 PDF | Request Standard
SKU: b2dc0cba899b

Thermodynamics of Incompressible and Compressible Fluid Flow

Standard by SAE International, 2011-06-20

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Language: English
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About This Item

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. 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.

SKU: b2dc0cba899b

Publication Date: 2011-06-20

Standard Status: historical

Publisher: SAE International

Document Type: Aerospace Standard

Subject: Combustion chambers, Methanol, Hypersonic and supersonic aircraft, Pressure, Carbon dioxide, Carbon monoxide, Heat transfer, ,

Official SAE: Doi link

New Version Available: AIR1168/1B (2025-02-25)
Previous Version: AIR1168/1A (2019-04-11)
This Version: AIR1168/1 (2011-06-20)

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