Egt rise with flow increase

[skyhigher]

To settle a friendly discussion what is the main reason egt increases with flow increase?

Thanks

[smudgethecat]

The more fuel you burn the hotter things get generally

[zerozero]

I think this is a trick question.

What day of the week is it?

:hmm:

[zerozero]

Actually, now that I think about this for a second...

:8

...in a piston engine you can get cooler EGTs with excessively rich fuel mixtures because the unburnt fuel absorbs some of the heat from combustion.

Is that the type of answer you're looking for?

[lomapaseo]

What flow is being increased?

What cycle are we talking about?

Are we talking about an increase in thrust on a jet engine? or some sort of idle point where bleed air is being manipulated?

Are you willing to share the proceeds of the bet?, if not bugger off with ye trick questions:)

[rubik101]

Crack most jet engines up an inch or so and the EGT goes down by 50C or more!
Note the temps next time you taxy and see for yourself.

[barit1]

In the higher power regime, a gas turbine runs hotter at higher rpm because of the temperature "extracted" in the turbine to turn the compressor, which itself is delivering hotter air (adiabatic heating) to the burner.

But slowly accelerating out of idle, it's common to see the temp. cooler at 80% e.g. than at 65%. This is because the efficiency is falling off at lower rpm. Thus there is usually a "bucket" or "sweet spot" at part power where the turbine temp. is coolest. :cool: