I am writing a model for LM Prepar3D to simulate the flight model of a commercial airliner.
The specification I am following requires some parameters from the engine (CFM56).
PRF(j) Fan compression ratio of engine j (PRF = Ptf/Pt∞) Ptf Pa Fan exit stagnation pressure Pt∞ Pa Infinite upstream stagnation pressure j is the engine number (left or right)
I have googled these parameters, but I haven't found any way to calculate these. Do they depend on the throttle setting? Or are they fixed on a per engine model basis?
EDIT: These data are needed to model the aerodynamic coefficients (coeff lift, coeff drag and moments) and not the engine itself. My problem is that I need to understand how to calculate
PRF(j) but I don't know whether it's easier to find
PRF(j) or to obtain it from the ratio between