Jordan Taylor
@Jordan_W_Taylor
5 Tweets • 2024-04-06 •  See on
rattibha.com 
Things that sound simple & aren't: The bearing and oil
system on a jet engine.
First, the main bearing locations on a Trent 1000
engine.
Bearings need oil, oil gets hot. Oil needs circulating
and sealing.
Next, the seals...
Rotating labyrinth seals are used to contain oil and
keep high & low pressure (and temperature) zones
separate.
But a rotating labyrinth seal isn't perfect, especially
when dealing with oil, and so we need something
else...
Compressor bleed air is used to keep the oil in by
creating an adverse pressure gradient in the labyrinth
seal.
But now the oil system needs to separate air &
particulates from the outgoing oil before it's returned to
the bearings.
Here's an oil system schematic of the CFM-56 engine,
complete with scavenge cycles, heat exchangers &
de-aerators.
Simples.
For the eagle-eyed, see if you can identify in the
images above the oil system assembly that went
wrong and caused the QF32 incident linked below
(different model of engine but similar general
structure. The failure mode has since been corrected):
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