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Exhaust leaving the cylinders contains a very small amount of superheated steam, that started out as atmospheric humidity. It has to be very hot for the oxygen sensor to work. The range of temperature is something like 900 degrees.
It's called dry stream. Superheated steam is dry steam and the type that does not impact the turbine blades with significant mass. Superheated steam is a different animal compared to the steam you see coming out of your tea kettle when it begins to boil.
The expansion ratio of superheated steam is something like 1000 times water in it's liquid state, while steam that has just begun to boil at 212 degrees F, is just beginning to become a vapor with a heck of a lot lower expansion ratio than the same water when it is superheated to 900 degrees under pressure then allowed to expand.
Regular steam like what you are talking about is not the same as the superheated atmospheric humidity that has passed through your combustion chamber where it has been subjected to peak combustion chamber temperatures of above 3200 degrees F.
The turbine blades spinning at say 75,000 RPM will, most likely suffer damage, from being subjected to non superheated steam. You could also create another issue by cooling down the exhaust portion of the turbine housing with the injected steam that is not superheated and completely vaporized.
It's just my opinion, and I did not research the numbers I threw out extensively, but I have no doubt that the potential for damage to the exhaust turbine blades exists.
regards
Mech
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