hi guys

i would like to know, if i compress air at mass flow of say 3kg/s at STP, through a three stage centrifugal compressor. would my mass flow of 3kg/s change at inlet to each stage? and will my compression index (polytropic/adiabatic index) change at inlet to each stage assuming i am able to cool the exit air from each stage to the initial temperature?

pls help guys