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wow this thread is great. Here's what I did in my water injection research. I first compress the water to more than 100 bar. Next I subject it to intense heat sources like exhaust gas and coolant. Water when compressed has its specific heat capacity and boiling temperature increased. This means, it can absorb a lot of heat without boiling.
Once water is heated, I inject it into the combustion chamber right after ignition has started. The intense heat will be absorbed by the water and the water will turn into steam to expand. High gas constant R will ensure that the steam expands few times better than air.
Read more of these in my 2 papers; SAE 2009-01-2808 and SAE 2009-32-0047. You guys gonna love these 2 papers.
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