On Thu, 11 Sep 2003, Steven M. Miller wrote:
> What is the service ceiling for Turbofan jet engines?
> Why do Jets run cooler than rockets?
First, a note of caution: although discussions ramble somewhat, bits of
current news creep in, and some of us get sloppy at times, the ERPS list
is primarily for discussion of ERPS projects, and secondarily for
discussion of peroxide rocketry. It's not a general rocketry-topics list;
the Arocket list is a better choice for that.
So I will answer very briefly, with a request that further discussion move
to Arocket or some other appropriate venue...
Service ceiling for turbofans depends on engine and aircraft; the U-2 and
some related projects (e.g. the "Suntan" hydrogen-fueled spyplane project
of the 1950s) suggest that the upper limit is 80kft or more. Current
commercial engines probably top out at 60kft or so.
Jets run cooler because 4/5 of the incoming air is nitrogen, which serves
only as a coolant. Also, they typically don't use all the oxygen in the
air, because of the need to preserve their turbine blades.
Henry Spencer
[EMAIL PROTECTED]
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