I wrote > Already the case: see above. I considered a spline, but the extra > complication doesn't really give a better outcome. Asymptotic ... OK up > to > a point, but at some rpm the compressor goes supersonic (depending on the > design) and output falls away. I attempt to model this in a general way, > while ensuring that the output remains positive for all rpm values, no > matter how unreasonable. I'll put the output on my website so that you can > see. I'm satisfied with this solution, but others are, of course, > possible. >
I've put the curves here: http://myweb.tiscali.co.uk/vmeazza/FlightGear/supercharger-1.pdf http://myweb.tiscali.co.uk/vmeazza/FlightGear/supercharger-2.pdf You can see that the Hoerl power function (labelled 'power') is nicely behaved for all values of rpm. I would argue that perhaps it ought to drop more steeply past peak power, but that's only instinct - I have no numbers to support it. V. _______________________________________________ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
