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Daft idea? Flash steam engine..

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fcheslop:
Not that well up on this.If you had a chamber and pumped the water in and restricted the outlet via a jet would that work?
Its the way an espresso machine works.The boiler is at 1.8 to 2.1bar water is pumped in at 8.5bar to a heat exchanger it then goes through a 0.8mm jet to the brew head and gives an outlet temp of 86 to 90 degrees celsius as the jets block the temp goes up eventually on some machines you end up blowing steam out of the brew head
Guess who plays with coffee machines :D
I worked in the plastic industry for a while the oil you need is HTO heat transfer oil if I remember correctly we ran up to 210 deg C

John Hill:
I don't expect this to be a high speed or high power engine, if I can get enough torque to overcome the friction of the engine that will suit me fine!

Getting a quick heat transfer would be an advantage and I assume surface area is the key.  One idea is to drill a 'big' hole, say 10mm, through the block and jam the hole tight with random jumbled very fine copper wire.

My concern is that the cold cylinder will condense the steam before it does anything useful hence the need to keep the cylinder how with a hot oil jacket or maybe just flame heat it.

RussellT:
Hi Hohn

I must be missing something here.  I don't understand why your copper block has to be separate from the cylinder.  If they were combined it'd be easy to keep the cylinder hot and you'd inject water directly into the cylinder.  You'd still need some sort of exhaust though.

Russell

vtsteam:
fcheslop:

wonderful stuff to see and read about!  :coffee:

John:

The injection into your block is momentary not continuous? Timed?


Well you know this works actually sort of, but with a diaphragm, in putt putt boats. They use a natural oscillation frequency to do the injecting, and the steam reaction to provide force and the outlets to enforce direction for outflow vs intake (which is less directional)

But of course it's only by ignoring the differences between things that you can say they are the same.

And you are thinking of a "real" engine with a piston.

I think you should build one!

John Hill:
I am thinking that the steam generator block would be the cylinder head.

Yes, I would use my 'nutating piston' scheme to have an exhaust port open for most of the up stroke.

Nutating engine project... http://madmodder.net/index.php/topic,1389.0.html 
.... as you can see the stationery displacer is an ideal candidate for the steam generator block.

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