From: starline@katamail.com
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
news:GubMb.3338$OA3.680556@newsfep2-win.server.ntli.net...
> 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.
>
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