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a)Air enters the intake of the engine.
b)It encounters a large low pressure turbine (which powers a compressor further down stream)
c)the air is then split into two streams; a small fraction of which passes into the compressor, and a larger fraction which bypasses the compressor (and combustion
chamber yet further downstream)
d) the small compressed stream enters a combustion chamber and is mixed with fuel and ignited. [the larger uncompressed stream bypasses this section]
e) the exhaust from the combustion chamber feeds into a pressure jet that entrains the bypass air and hopefully creates more thrust than the drag created by the initial turbine.
This jet is like a ramjet in that it needs a 'bump start' but hopefully will be more efficient at subsonic speeds.
The Gluhareff Pressure Jet Engine
http://tipjet.com/Tech_data.htm
this describes one form of pressure jet. Think the explanation could benefit from more diagrams though. [humanzee, Jul 30 2005]
[link]
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By "using up" some of the air's relative velocity, you're turning this into a ramjet with a blocked intake, it seems. |
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I don't think the turbine would block the intake. Imagine it more as a ducted windmill than a conventional turbine. |
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My understanding of a conventional engine is that the turbine spins the opposite way that yours does, "sucking" in more air and compressing it. |
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So it goes turbine --> compressor --> combustion chamber --> free discharge? The turbine followed immediately by the compressor (with nothing in between) would be effectively the same as a big turbine OR compressor, only with nothing powering it. Except of course for the 'suction' from the combustion chamber - which, by the way, wouldn't work too well as the system would instantly tend to a state of no compression. |
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The bypass thing is widely baked, but I assume you know that already. |
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EDIT: Sorry, I missed the thing about the pressure jet on the back end. Tentatively still standing by my comments though. |
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I think I get it: the combustion exhaust pulls enough bypass flow to keep the turbine and compressor stages rolling. Yeah, it could work, maybe. It would work a lot better if you had the combustion feed into the expansion stages to keep the turbine and compressor stages rolling, which feeds more air, which fires better, which helps feed more air, etc. |
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What you've described is a thrust-augmented rocket, nearly. It gets too little air and seems to be designed to use up what little power it generates, driving the fan. |
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