3 ms·
When you say "cold air" I guess you mean that it's bled before the combustion stage. It's not cold at all after the compression. And bleed air is indeed always
by benhurmarcel 6y ago
When you say "cold air" I guess you mean that it's bled before the combustion stage. It's not cold at all after the compression.
And bleed air is indeed always taken in the compressor, never in the turbine. First there's no point taking it later than the compressor, you just want compressed air. And it's ultimately used to ventilate the cabin, you don't want fuel vapors or smell.
- aunty_helen 6y agoStage 5 would be pretty early on. However generally when talking about the HPC you're talking about cold air. At this stage, cold air that's sprayed on the turbine housing when engine power is reduced to thermally shrink the metal to keep the turbine blades and casing within tolerance for efficiency's sake. All is explained in the link I posted, would recommend it as good introductory reading on the subject.