My diesel injector keeps coking and clogging, distorting the spray pattern, could ultrasonic energy keep the coked particles from clogging the nozzle?
Diesel generator operation
2007-08-15 20:11:58 · 4 answers · asked by DH 1 in Science & Mathematics ➔ Physics
It's coking because I'm heating the fuel and gaining slight fuel economy.
Acoustic decoupling from the head sounds mysterious. How could I do that and keep the seal? Hmmm.
2007-08-16 23:34:28 · update #1
Oscillating fuel is goal. Transducer on injection line would oscillate the fuel inside.
Hopefully, oscillations will reach the nozzle enough to continuously keep from clogging.
2007-08-17 05:59:27 · update #2
Oh yea, the clogging is from polymerization of vegetable oil in the injection line due to heating.
2007-08-17 06:00:56 · update #3
This sounds like a very interesting idea. Untrasonics could also improve atomization. Modern atomizers for humidifying air use ultrasonics. So do cleaning machines. I would suggest doing a little research to see if this sort of thing has been experimented with to improve engine performance. You may be reinventing the wheel. Google everything about diesel engines you can until you get the names of appropriate engineering journals on the subject, then go to an engineering library. If you want to experiment, you will have to modify the injector interface to acoustically decouple it from the engine to some degree.
I do have a question though. Is injector build-up generally a problem with modern fuels? Maybe you've got a bad batch of fuel.
Acoustic decoupling just means you want to vibrate the injector without the vibrational energy leaking into the engine structure. Vibrating the whole engine will take considerably more energy! Normally this is done with a rubber mount. That might be problematic in terms of pressure containment, though. Any flexible springy thing will help. Maybe a metal diaphram. A little book larn'in about acoustics would help. You need to find the injectors resonant frequency with a variable oscillator and a piezo pickup probe. Attached the probe to the injector and scan the frequencies until you hit a resonance. That's when the amplitude peaks.
Almost forgot. Contections (such as to block and fuel feed) need to be at the vibrational nodes of the injector. The nodes of a vibrating body for a given resonance are lines/surfaces that do not translate (only compress and/or rotate). It can be touched there without significantly damping the vibration. One holds a tuning fork, for example, near it's primary node.
Good luck.
2007-08-16 16:24:32 · answer #1 · answered by Dr. R 7 · 0⤊ 0⤋
No, if this was the case it would be a fundamental flaw in all diesels. Your filtering system must be in top shape, injector nozzles are extremely sensitive to minute particles of dirt of any kind..
2007-08-22 10:59:47 · answer #2 · answered by johnandeileen2000 7 · 0⤊ 0⤋
Yes, but you may damage other parts of the injector itself.
2007-08-16 03:19:35 · answer #3 · answered by bluecuriosity 2 · 0⤊ 0⤋
interesting idea. Try this injector cleaner/fuel conditioner: http://www.amsoil.com/redirect.cgi?zo=1463115&page=StoreFront/adf
synthetic oil is also known to improve fuel economy:
15W-40 CI-4+
http://www.amsoil.com/redirect.cgi?zo=1463115&page=StoreFront/ame
5W-40 CJ-4
http://www.amsoil.com/redirect.cgi?zo=1463115&page=StoreFront/deo
2007-08-18 02:05:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋