On 05/12/2012 09:32, JF Mezei wrote:
On 12-12-03 16:17, Jeff Findley wrote:

For the same reason an engineer would put an "intercooler" on a car with
(multiple) turbochargers.

http://en.wikipedia.org/wiki/Intercooler

OK, so the goal is to increase air density to allow better combustion ?

However, if you cool already compressed air between compressor and
combustion chamber, you reduce pressure and increase air density, but
are still pushing the same quantity of O2.

Is it correct to state that they would have to cool the air prior to it
entering the compressors so that the compressors would then suck in
denser air and thus push more air through the engine ?


Above mach 5, on board LOX tanks would feed the engines in "rocket
mode".

Does rocket mode still involve the compressors of the jet engine
spinning ? (fed with O2 instead of outside air) Or does it shift
combustion to aft of last compressor stage and propulsion hapening by
pure expansion of gas without that gas spinning any turbines before
leaving engine ?


I believe the air inlets are completely closed in rocket mode.

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T