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Below, a derivation for the normalized corrected mass flow is shown. This demonstrates the difference between real gas corrections and ideal gas corrections.

 

For the corrected mass flow a similar derivation exists:

 

The diameter DI is not of interest if the same machine is considered, and Wref is usually 1, the equation can be rewritten to (including real gas effects):

 

This reduces to:

 

if no real gas effects are considered.

 

The Greek characters theta and delta represent the correction factors to refer engine parameters to ISA sea level static conditions.