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self venting combustion idea

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will this work

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self venting combustion idea

Unread postAuthor: pyro86 » Tue Dec 05, 2006 4:04 pm

tell me if you think this will work with a .75 to 1 CB ratio
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Unread postAuthor: PVC Arsenal 17 » Tue Dec 05, 2006 4:54 pm

explain???? Not gettin the idea here...
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Unread postAuthor: Bluetooth » Tue Dec 05, 2006 4:57 pm

Me neither??? Looks like some kinda sealing piston thing though for a vent???
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Unread postAuthor: }O0{ » Tue Dec 05, 2006 6:45 pm

Is the red part a valve? Everything like in internal combustion engine?
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Unread postAuthor: King_TaTer » Tue Dec 05, 2006 6:55 pm

ok maybe hes talking caveman and the red thing is actually a plunger that creates air pressure in the chamber and causes a spud to plop out the end lol. ok, before u guys rip and call me a dumbass... it was a joke lol, you never know
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Unread postAuthor: frankrede » Tue Dec 05, 2006 9:29 pm

its a vent that works like a check valve.
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Unread postAuthor: King_TaTer » Tue Dec 05, 2006 9:32 pm

yes thats probobly wat it is lol i was just messin 'round
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Unread postAuthor: boilingleadbath » Tue Dec 05, 2006 9:50 pm

This is at least the fourth time something like this has been proposed, and atleast the second time on spudfiles.

...that said, I don't know how well it'd work for your standard combustion launcher; they arn't exactly designed to be pulse-jets, and the velocity of their air collum is MUCH lower.

(which is why, in my interation of this concept, used a .4:1 C:B ratio; the projectile gives up a tad bit of energy, but it should vent it.)
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Unread postAuthor: frankrede » Tue Dec 05, 2006 10:38 pm

So how does it work?
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Unread postAuthor: Killjoy » Tue Dec 05, 2006 10:49 pm

Im thinking (and correct me if im wrong) that as the gases (from burning the fuel) expel out of the barrel behind the spud, they create a negatuve pressure which pulles the piston thingy forward to alow air to flow into the chamber. To me though, the negative pressure would be almost intitanios so barely any fresh air would flow into the combustion chamber cause the piston thingy would move forard and back in less then a second.
wouldn't it just be easir to add a fan and a ball valve to vent the chamber though?
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Unread postAuthor: boilingleadbath » Tue Dec 05, 2006 10:51 pm

In the same fashion as a valved pulse jet; the momentum of the moving air in the barrel means that it keeps moving after there is no pressure in the chamber, thereby drawing fresh air in through the check valve in the rear of the chamber.

In my design, I don't trust the air to be able to remove it's self... so I proposed making the barrel extra long, so the projectile draws the air along with it.
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Unread postAuthor: pyro86 » Tue Dec 05, 2006 11:38 pm

boilingleadbath has the right idea
the red thing is basicaly a big checkvalve
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