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self venting combustion idea
Posted: Tue Dec 05, 2006 4:04 pm
by pyro86
tell me if you think this will work with a .75 to 1 CB ratio
Posted: Tue Dec 05, 2006 4:54 pm
by PVC Arsenal 17
explain???? Not gettin the idea here...
Posted: Tue Dec 05, 2006 4:57 pm
by Bluetooth
Me neither??? Looks like some kinda sealing piston thing though for a vent???
Posted: Tue Dec 05, 2006 6:45 pm
by }O0{
Is the red part a valve? Everything like in internal combustion engine?
Posted: Tue Dec 05, 2006 6:55 pm
by King_TaTer
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
Posted: Tue Dec 05, 2006 9:29 pm
by frankrede
its a vent that works like a check valve.
Posted: Tue Dec 05, 2006 9:32 pm
by King_TaTer
yes thats probobly wat it is lol i was just messin 'round
Posted: Tue Dec 05, 2006 9:50 pm
by boilingleadbath
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.)
Posted: Tue Dec 05, 2006 10:38 pm
by frankrede
So how does it work?
Posted: Tue Dec 05, 2006 10:49 pm
by Killjoy
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?
Posted: Tue Dec 05, 2006 10:51 pm
by boilingleadbath
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.
Posted: Tue Dec 05, 2006 11:38 pm
by pyro86
boilingleadbath has the right idea
the red thing is basicaly a big checkvalve