Jet Engine Compressed air Pressure for various altitude and velocity

[vincentryan]

HI
In Jet Engine, i want to know that the compressed air prssure changes before it enters into the combustion chamber from the compressor in various altitude and velocity or it is consatnt for altitude and velocity?

[FredGarvin]

The air will pass through a final stage diffuser prior to going into the combustor. It will definitely be different at various operating conditions.

[minger]

Static air pressure changes in altitude, so altitude affects the pressure ratio. Vehicle speed affects the effective total air pressure, so airspeed affects the pressure ratio.

Conditions are VERY different between operating conditions and proper flight envelopes or mission defintions need to made before any design can be done.