I captured a compressor map from Holset's newsletter. Unfortunately it does not state to which turbo model it belongs to (no surprise there).

I wonder if any forum member is good with numbers, and thus be able to offer a helping hand in translating the airflow numbers into something more familiar. This way we could start a guessingwork from which modern turbo compressor the map may well be from.

Here's the captured map (note-pls click 'view full size' at the bottom of page):
http://community.webshots.com/myphot...ecurity=mApMkI

 

600 megawatts is good with those conversion factors, as well as a few others. But he's the first that comes to mind. The pressure ratio on that compressor is something else, I'll tell you that. I believe the europeans grade their compressors at a higher ambient temperature than we do as well...might be wrong on this, but worth keeping in mind.

If this pertains to the PM you sent me a while back, those numbers didn't do anything for me, after a few hours of searching I came up dry. Northslope (the numbers man) is working the angles too. We haven't forgotten.....just delayed!!

Chris

 

This is a new map I found.
Now I have two weird maps for you folks to sort out

A thought on grading the compressor at certain air temperature.
Seems to me the Holset people have incorporated that as a variable in the formula of calculating the mass flow. The 'K' in the equation most likely stands for Kelvin temp scale. Also slight variation of atmospheric pressure is taken into equation as well, thats where the 'MPa' steps in (being abbreviation from Mega Pascals).

Normal atmospheric pressure is 1013.25mbar, = 0.101325MPa

Air temp could be for example 20ºCelsius =>
(273º+20º) = 293ºKelvins

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"kelvin to fahrenheit conversion calculator"

http://www.metric-conversions.org/te...fahrenheit.htm

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I tried hacking the numbers, but came up with pretty far out flow numbers.
My numbers are correct only if they use this turbo to boost the space shuttle engines

 

I can't do anything with specifications but I could do something with part #'s