May be it is a good idea to meet the published TSFC values at cruise speed (N1 about 80 or 85 %), not at N1=100 %
That's a good idea. We can assume that most TSFC values will be given for cruise conditions, about 80 to 85 percent N1. The turbine model uses N2, only because it has to also make sense for turbojets. This formula looks better:
correctedTSFC = TSFC * (1.5 - (N2norm * 0.58823));
This will make the TSFC value just right at 85% N2. It also flattens the curve a bit which will result in less variation over the range of N2.
Dave
I think this is a good first approach. But it covers not the static
thrusts condition, when the aircraft is at the airport. There must
be a dependency with the airspeed. I search for hours on the net to find some hints regarding this item. Nothing.
Never mind. To have a correct fuel consumption for cruise is more important than the consumption at the airport. We just have to hurry up with take off :)
Hans-Georg
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