Injecting water in to the jet engines it's a common practice.

This is a part of the book: "The jet engine" by Rolls Royce...In the 17th
chapter it's written:

"The maximum power output of a gas turbine engine depends to a large extent
upon the
density or weight of the airflow passing through the engine.
There is, therefore, a reduction in thrust or shaft horsepower as the
atmospheric pressure decreases with altitude,
and/or the ambient air temperature increases. Under these conditions, the
power output can be restored or,
in some instances, boosted for take-off by cooling the airflow with water or
water/methanol mixture (coolant).
........ the injection of the coolant into the combustion chamber is usually
more suitable for axial flow compressor engines....

I think that pre mixing water with fuel it's hard to achieve 'cause these
two substances are difficult to mix
and the result could be an emulsion and not a perfect mixing.




"toby" ha scritto nel messaggio
...
I looked on the web curious about thrust augmentation concepts for jet
engines and found a 1952? NACA report that detailed an experiment where
water was injected into the combustion chamber to increase mass flow and
so
thrust.

However, the water and fuel were injected separately and the researchers
limited themselves to only adding 20% (I think) water because they thought
it would start interfering with combustion stability or something.

Has anyone heard of any research into pre-mixing the water and fuel
together
to avoid this problem? Or any other similar research like running jets on
water-alcohol fuels, or water-oil emulsions to achieve the same effect.

Toby.