[AR] Re: P&W GTF
- From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Sun, 05 Apr 2020 10:05:47 +0200
Am 04.04.2020 um 20:17 schrieb Henry Vanderbilt:
Is it just me, or is this the commercial airliner turbofan evolving back
toward the old reduction-gear driven turboprop? Seems like a
halfway-point, this does. Only they'll never remove the fan shroud,
because then it wouldn't be a "jet" and people might notice that, even
aside from Concorde, airliners are cruising slower than the planes our
parents flew in.
( ... cloaked in a spray of shockwaves.
and they sucked twice the fuel for the distance .-)
supercritical profiles show real gain.
Borders aren't that sharp anyway.
High bypass jet engine
propeller turbine
unshrouded whatnot.
residual thrust from the core is one differentiator.
generated noise an acceptance differentiator.
Beyond larger fan for better propulsive efficiency
the better than doubled rpm (vs the ungeared predecessors ) of the LPT
system reduced size and parts ( the GTF has significantly less
blades/stators in the path.).
Uwe
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