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![]() Mike Rapoport wrote: Water injection does not increase efficiency, it lowers it. The water goes in as a liquid and goes out as a gas. The energy to do that comes from burning fuel. Same thing is true of a steam engine. In a steam engine it is the phase-change of the water that makes it possible to convert the heat from burning fuel into mechanical energy. It will always take more fuel to produce a given amount of power with water injection than without. Water injection does allow higher MP or higher compression so the engine can produce more power. The thermodynamic efficiency of a heat engine is a function of the compression ratio. Increasing the compression ratio increases the efficiency. That is not to say that with water injection there are not also increased losses that negate that advantage, but the fact remains that increased compression ratio, absent other factors, increases efficiency. Piston engine fighters used it for more peak horsepower and some turbines use it for the same purpose but it definately come at the price of higher fuel burn per horsepower. Ok, I believe you. -- FF |
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