Hello,
this probably won't work at rocketry.
Injectors are standard fitting of nearly every steam locomotive. The problem is, the steam has to condense in the water to transfer the energy to pressure (speaking simply).
It's not as simple as that as the steam is moving very fast and transfers its kinetic energy to the water; so only a proportion of the energy ends up as heat and in any case the steam is less than 10% of the volume of the water and cold after going through the De Laval nozzle.
They gain a output pressure that is higher than the input pressure of the steam. But they are known to have problems when the temperature of the feedwater is to high to condense the steam.
It may be a problem if you are doing regenerative cooling, otherwise the fuel in the tank is at a known temperature. Still, after going through the injector you are under higher pressure, so the boiling point has gone up.
LOX would probably evaporate inside the injector, thus no pressure would be able to build up.
Ultimately it depends on the chamber pressure since that determines how much oxygen you add to pressurise up the LOX; and the chamber pressure is a design choice.
I have serious doubts about H2O2, too.
Unless the H2O2 decomposes significantly I don't see that there's any problem; to a first approximation H2O2 has similar properties to water and it works well enough with water. 80 bar is plenty good for a chamber pressure.
Michael Meinl
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