Hello, I am currently working on a storage project which allows me to decouple the compressor from the expander of a gas turbine. (see image link below) The reason I use a gas turbine is to reheat the air which was cooled after being compressed. As you can imagine there is a efficiency loss associated with that. When thinking of ways to improve the efficiency during the power generation phase (expansion) I was wondering if adding "small amounts" of water in the combustion chamber would increase or reduce my efficiency... By "small amounts" I mean amounts higher than atmospheric air, but that would not lead to condensation. I can think of arguments for both but don't really know which one would be dominant: 1) Improves Efficiency: Adding liquid water into the combustor and converting it to steam would greatly increase it's volume and therefore increase the inlet pressure to the expander and hence produce more work out of the expansion. 2) Decreases Efficiency: Converting the liquid water to steam would drop the temperature of the gas entering the expander and therefore reduce the work of expansion.