> 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
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David Culp
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