3 ms·
According to the AD this is the 5th stage bleed air valve, so on the compressor side and cold air. >Bleed air is tapped at the 5th and 9th stages of the HP com
by aunty_helen 6y ago
According to the AD this is the 5th stage bleed air valve, so on the compressor side and cold air.
>Bleed air is tapped at the 5th and 9th stages of the HP compressor and from the fan.
https://hursts.org.uk/airbus-technical/html/ar01s19.html#idm45838557976224 https://hursts.org.uk/airbus-technical/html/ar01s19.html#idm...
(Airbus doc but the engines are CFM56 on the 737 models listed)
Also according to this page the CFM56 doesn't have a turbine bleed air takeoff.
- benhurmarcel 6y agoWhen 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.