Quote:
Originally Posted by t vago
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Liquid water does not just magically turn into a gas. If it did, people would not be able to survive near a stovetop that had a boiling pot of water on it. All that boiling water expanding 1700 times in volume or so in an instant, you know.
Do you understand that liquid water takes a lot of heat energy out of exhaust gas in order to change from a liquid into a vapor? Do you understand that said process will cool off the gas in question, and will lower its pressure as a result?
Here's something else that just came to mind: You do realize that you need a pressure differential to inject water into a vessel that's at 150 psia, right? In other words, how are you going to pressurize water to be above 150 psia, so that it'd squirt into your engine? How much power would you need to do this? How are you going to prevent 1200 to 2500 psia burning charge from leaking into your water injection mechanism?
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it takes a LOT of energy to turn water to steam. It will get that energy from the temperature of the exhaust gases, which will end up with a lower pressure due to pv and nrt.
But when water turns to steam, it expands a LOT. It expands at a ratio of 1700:1.
Discussing this with you has helped me understand the basics of the entire concept.
And, the cool thing is, like you said earlier, the engine is DESIGNED to handle the water and the water is already in the exhaust.
You don't need to direct inject the water. Inject it in the intake as small droplets (just like gasoline is) and it will do its thing.
It is ok to admit you can't figure out how to do the math on the water expansion - I can't figure it out either.
That is why we try experiments!!!!!