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Air Injection engine

Inject air instead of fuel in an ICE
  (+1, -2)
(+1, -2)
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The fuel is injected and vaporized by the cylinder heat anaerobically in an intake manifold heat exchanger combination. The vapor enters the cylinder normally and is compressed.

Air is pressurized by a turbo off the exhaust and injected into the cylinder. I doubt that a spark-plug would be needed once the engine reached operating temperature.

The exhaust cycle would be normal.

The limiting factor would seem to be excessive heat on the lubricants and components.

raytork, Jul 29 2008

Animated Scuderi http://www.scuderig...split_sideview.html
Split cycle engine [baconbrain, Jul 29 2008]

See my comment on 03 Sept 2007 Tricylinder_20Supercombustion
[Ling, Jul 31 2008]


       What stops it all igniting on the induction stroke?   

       If it requires the compression stroke to raise temps enough for ignition, then you seem to be describing a diesel engine, albeit an inefficient one (no intercooler on the turbo).
Texticle, Jul 29 2008

       Ah, I see now. There is no air present on the induction stroke.   

       The initial part of the burn will be fairly rich, and this will lean out towards the end of the air injection stage.   

       Also the air port must be open for much of the power stroke. What stops the burning charge from blowing back into the air manifold? This requires explanation, as it seems like a fatal flaw. The outlet pressure of the turbo will not be sufficient, and certainly not at idle or under partial load.
Texticle, Jul 29 2008

       Third annotation. The air manifold valve will not form a perfect seal. That fuel vapour, above its flash point, is going to start burning _somewhere_ undesired.
Texticle, Jul 29 2008

       There won't be enough vapor to speak of compressing, I don't think. The fuel takes up little volume.   

       Injectors into the combustion chambers are well-developed. Injecting the fuel into some other area, vaporizing, then moving, valving and compressing it is needlessly otiose.   

       I do know that if this used another piston to compress the air, it would be a Scuderi split-cycle engine. See link. I doubt a turbo could get the air compressed enough.   

       Anyhow, this idea might be possible, but what's the advantage? The Scuderi has a few, but I'm not seeing anything here.
baconbrain, Jul 29 2008

       ummm if there is no air on induction then the engine is mechanically less efficient than a standard otto cycle... (is it bad science ?)
madness, Jul 31 2008

       raytork, have a look at my link. Slight variation: compress fuel vapour and inject some other oxidiser instead of air.
Ling, Jul 31 2008

       See also the Japanese "Long Lance" torpedo from WW2 which used compressed oxygen as its oxidiser supply.   

       The idea is similar to the Brotherhood wet-burner cycle engine also used in torpedoes.
8th of 7, Aug 03 2008

       The Idea was to allow cylinder temp to increase massively, so as to increase the Carnot ti
raytork, Feb 05 2010


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