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Old 04-17-2012, 11:18 AM   #18 (permalink)
Master EcoModder
Join Date: Dec 2011
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imagine the combustion chamber at 600C full of hot gasses at a pressure of 500 psi.

Add excess liquid water. My GUESS is the pressure will go up slightly, the temperature will go down significantly.

Now expand the volume by letting the piston go down. As the piston goes down, the pressure normally would go down, but the liquid water is rapidly turning to steam.

Overall, on average, the resultant temperature WILL be significantly lower over the entire stroke of the piston as the latent heat of vaporization for water is very high.

Will the average pressure be higher or lower with water?

Thought experiment two. Imagine a 4 or 2 stroke engine, except it has superheated piston, and we have direct injection of liquid water. We inject the water at TDC.

Will this engine "run"????
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