Originally Posted by
Winemaker
Isn't that for pistons engines though? A different situation and common in WW2.
No works for jets and turboprops as well.
This is what Wikipedia has to say about the subject:
Adding water increases the mass being accelerated out of the engine, increasing thrust; and it also serves to cool the turbines. Since temperature is normally the limiting factor in turbine engine performance at low altitudes, the cooling effect lets the engine run at higher RPM with more fuel injected and more thrust created without overheating.