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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Hi, I've been spending abit of time design a pulsejet, I've spent some time on some jet engine foroum to learn some stuff,but I think this site would be better for some questions
If you have a combustion chamber full with fuel air mixture, if you have multiple spark gaps spaced over the chamber, if fired at the same time to make it all ignite quicker, will it form more pressure than just one spark gap burning slower,is it based on the increase in temperature of the fuel air mixture, or is there some part that is linked to the speed of ignition.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I'm not a pulsejet expert and it's a while since I read up on them, but ultimately, it's the rate of expansion that produces the force, this 'may' be increased with multiple ignition points.
Multiple sources should provide more reliable ignition, but this may be an 'imaginary' problem.
While it's not relevant to pulse jets, I've always thought it might prove interesting to utilise a turbo in a jet engine, the turbo supplying pressurised air to the jet
Registered Member #19
Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
I've seen this done on a few automotive engines. Looks like airplanes use this tech as well Dual Ignition
The wiki article does not contain a lot of information. The main goal looks like efficiency (complete burn instead of a partial burn) and safety in the case of aircraft. I had a friend in college who had to make an emergency landing because an ignition coil failed on the airplane he was flying. Math prof. said it was the best excuse he has heard for being late.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
The anomaly, I haven't looked up the links yet, I do know petrol engines are fuel rich at 5% about it detonates,but with pulsejet would that be a good thing to,IF it does increase the pressure more than fuel joules.
Ash thinking the same thing draw up this picture
Near the gas inlet is 50 3mm holes at 90/90mm box section to act as flash back arrestors and extinguish the flame.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
weve used "chinese valve pulse jets" for RC. there really finnicky, take forever to accelerate and if you turn they loose thrust and you lose airspeed, you then start over, you can also burn your tail off too. we've done that. generally we consider them worthless. but there was an example on the science channel that showed a 200 mph working Rc jet. so it can be done.
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question about designing a pulsejet
