Hello all,
I tried to understand the calculation of the fuel consumption of the A320. In the engine configuration file I found the
TSFC thrust-specific fuel consumption (lbm/hr/lbf)
parameter set to 0.657 . Then I compared the fuel consumption with thrust (/engines/engine/fuel_flow_pph with /engines/engine/thrust_lb)
and when I set N1=100 %
TSFC = fuel_flow_pph/thrust_lb
But this formula is only valid, when N1 is 100 % For values lesser then 100 % the formular is not valid. The fuel consumption is much greater then it should be.
I compared this result with the ICAO ENGINE EXHAUST EMISSONS DATA BANK
where I found some performance values for different power settings (100 %, 85 %, 30 % 7%) of the A320 engine CFM56. There the formula is always valid.
Is this behaviour a bug or a feature ?
Where is the fuel consumption calculated ?
In the jsbsim-code FGSimTurbine.cpp I only found this peace of code:
if (!Augmentation) {
FuelFlow_pph = Seek(&FuelFlow_pph, thrust * TSFC, 1000.0, 100000);
if (FuelFlow_pph < IdleFF) FuelFlow_pph = IdleFF;But there the fuel flow is calculated in the way I understand
Thank you for any help
Kind regards
Hans-Georg
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