Originally Posted by
orion1210
We are all aware that gas turbine engine performance can be reduced as a result of compressor and turbine deposits in terms of increased fuel burn resulting in increased turbine temperatures.
Aside from this, I wondered if anybody could put any figures on potentially reduced thrust output or the resulting cruise speed penalty as a result of a dirty and therefore a less efficient fan, assuming that a given N1 can still be obtained without being turbine temp limited?
Thanks
Pretty hard to notice pure thrust differences of such a small magnitude beyond what's auto-controled
What's noticeable and documented is the EGT and fuel burn (over hours) with a dirty fan.
Most effects are due to bug spatter which on some routes and days is quite noticeable on walk-arounds. Even quite difficult to tell from a small bird-strike with no damage.