I am confused about compressor curves reading and I would just like to ask about the following:
1. Is polytropic head mathematically related to flowrate? I have been using the equation below and I cant seem to find the mathematical relationship of polytropic head with flowrate.
Head (poly) = (n/n-1) (ZRT/MW) ((P2/P1)^(n-1/n) - 1)
Specifically, I would like to ask why the polytropic head (energy required to compress a fixed mass of gas) decreases as the flow increases.
2. I would also like to ask about compressor's system resistance curve which is constructed by plotting pressure drop versus flow rate.
dP = (0.5(density)(V^2)) (4fL/D)
Will the curve shift to the left when the flow is increased? or is it to the right?
Thank you very much!!
Edited by rpdlpascual, 17 September 2018 - 09:20 PM.