Allison 250 turbine engine cutaway.
I agree agree with GT those incredible tiny engines never let me down in 1300hrs of A109A time - memory might be wrong and many engines have gone in between since those days but I think the 10 second Q limit on both engines was 145%? Obviously pre FADEC. I just remember it being very generous.
Join Date: Sep 2007
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The workmanship and visual/audio effects used in the cutaway model are fantastic.
One suggestion I would make is a slight change to the coloring scheme used to convey the relative metal surface temperatures in the gas flow circuit. The color scale (cold to hot) of blue-red-orange-yellow-white is appropriate, since that is approximately the color change progression that takes place in metals as they heat up. Since this is an educational tool for mechanics & pilots, what you want to convey visually is the relative temperature of the metal surfaces in the various sections of the gas flow circuit. With regards to safety and reliability of these metal components, temperature is a major factor.
It looks like the color is created by painting the surface of the parts, so it would seem fairly easy to produce various shades of each color. I would suggest using the following color scheme to provide a more accurate representation of the temperature gradients: First, the compressor stages should progressively change from blue to dull red, as this would represent the increase in temperature from one compressor stage to the next. The gas temperature at the discharge of the final compressor stage on this particular engine is probably in excess of 500degF, which is not really "cool". Second, the combustor color should progressively change from orange to yellow, and finally to white at the turbine inlet nozzle. The turbine inlet nozzle is where metal surface temperatures are highest. Lastly, the color of the turbine stages should progressively change back from white to yellow to orange, since the gas temperature drops as energy is extracted by each turbine stage.
I apologize if my suggestions sound like nitpicking. My only intent is to just help make an already excellent educational tool a little bit better.
Regards,
riff_raff
One suggestion I would make is a slight change to the coloring scheme used to convey the relative metal surface temperatures in the gas flow circuit. The color scale (cold to hot) of blue-red-orange-yellow-white is appropriate, since that is approximately the color change progression that takes place in metals as they heat up. Since this is an educational tool for mechanics & pilots, what you want to convey visually is the relative temperature of the metal surfaces in the various sections of the gas flow circuit. With regards to safety and reliability of these metal components, temperature is a major factor.
It looks like the color is created by painting the surface of the parts, so it would seem fairly easy to produce various shades of each color. I would suggest using the following color scheme to provide a more accurate representation of the temperature gradients: First, the compressor stages should progressively change from blue to dull red, as this would represent the increase in temperature from one compressor stage to the next. The gas temperature at the discharge of the final compressor stage on this particular engine is probably in excess of 500degF, which is not really "cool". Second, the combustor color should progressively change from orange to yellow, and finally to white at the turbine inlet nozzle. The turbine inlet nozzle is where metal surface temperatures are highest. Lastly, the color of the turbine stages should progressively change back from white to yellow to orange, since the gas temperature drops as energy is extracted by each turbine stage.
I apologize if my suggestions sound like nitpicking. My only intent is to just help make an already excellent educational tool a little bit better.
Regards,
riff_raff
