Valveless pulsejet with afterburning augmentor
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- Опубликовано: 11 окт 2024
- This was an experiment I did about four years ago to see if injecting fuel into the augmentor of a pulsejet would increase the thrust. It didn't -- but there were some pretty flames :-)
Certain valveless designs are completely self-starting and with augmentors produce large amounts of thrust for their size. If you could efficiently water cool one it could be even more versitile.
Sounds like a V-1! Nice work!
i liked that when he jummes at the beginning hahahahaa boom
Marvelous! Bravo! Splendid! I love it!!!
The problem here is there is so little compression in a pulsejet that all you are doing is throwing away fuel with an afterburner. It's like you have constructed a giant Bic lighter.
I also feel this needs to be moving to get a ramming effect over the cowling, maybe a wind tunnel is needed.
beside the DIY cruise missile, are there any realistic uses for these engines? they seems to have a lot of shortcomings, they're noisy, inefficient, run at high-temperatures, are unreliable and need a starting flow, what's so great about them?
it will only create more thrust if its not lowering the pulsejet thrust which could easily happen with the backpressure created from the aug, that and the aug burn should happen inside and out of the exhaust can.
YES!!! mine is in progress now!! What tool did you use to cut the inner diameter of the cones? I'm using stainless this time
i have a sugestion >.> what if you could make a heat sink around the engine and circulate water trough it, then the hot water circulates around the propane tank helping the gas mantain its preasure... It would be pretty eficient, gas tank cools water and the engine warms it up again
@xjet cant you make a vid on how to do these? please it would be a great week project when im at home
i bet your neighbors love you...
@tangnatalaga Ram jets rely on air entering the engine at high speeds, and thusly a high pressure, to be mixed with fuel then ignited..
in my view, this is a great idea, but bad application. adding fuel to an augmenter that is located near the air inlet could not possibly work unless you have "timed fuel injection". adding fuel to the tail pipe augmenter should work much better. fuel should be sprayed in the gap between the tail pipe exit and the augmenter opening. during the exhaust cycle, fuel will mix with air and burn in the secondary augmenter. during the intake cycle, fuel will mix with air and burn in the primary augmenter. by providing fuel in the gap, you can have a consistent lean burn. when it comes to an afterburning augmenter near the air inlet, it cannot possibly work. One of the reason is that with direct injection, unburned fuel is ejected in the air inlet. this is already too much fuel to mix with the augmented air. remember almost half of the fuel is lost when fuel is injected into a pulse jet engine. In most valveless engines, the path for this unburned fuel is the air inlet. also note that the amount of air that is being pushed into the augmenter is smaller than the amount of air that was used for combustion considering the amount of thrust generated by the augmenter. if the air in the augmenter is less than the air that was used for combustion, the unburned fuel cannot be burned in the augmenter. so it makes no sense to add more fuel there. there is already too much.
I am building the same engine and when I blue air into it, all I get is a very deep and loud continuous roar. I am using 6 x 1.8mm holes 3 in mutually perpendicular plane as an injector. Please help me I need to get this running
how many lbs of fuel per minutes it consume at full power ?
remindes me of the sound of a two stroke
yeah imagine having to listen to that while on a plane.
if they're built properly,they're pretty much the opposite of what you describe aside from noisy..they are noisy...but if they are built correctly they are very reliable compared to a turbine engine(how many moving parts,spinning how fast??)the only real point of possible failure is if you use a valve intake...otherwise theres not much that can go wrong with them
If we can fit these kind of jet cluster of air craft ?
Hahahahaha. Hell yeah, that made him jump xD
how come you only ran it for five seconds?
that thing wants to move forward and your holding it back
It would probably mess up the resonance, is my guess.
I do!
Today is now
actually they are very efficient their is no moving parts.
Accoustics
@blahdob haha i do.
show me an internal combustion engine that does'nt get hot
LMAO