Acoustic Velocity

A relationship that is useful in compressor and compressor systems is the speed of sound of the gas at the flowing conditions. The acoustic velocity, a, can be calculated using the following equation:

a ~ x kRgT where k = ratio of specific heats R = specific gas constant g = gravitational constant T = absolute temperature of the fluid

The Mach number is given by

The relationship for uniform flow velocity V in a cross-sectional area, A, such as a compressor flow channel or nozzle is

where

Q = volumetric flow.

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