compressor stall
Pegase Driver
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compressor stall
Probably already discussed here in the past, but can anyone with knowledge know if bad maintenance or bogus spare parts can cause/contribute to a compressor stall in a modern Jet engine ?
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posibly
its very posibly could make it happen ie on bogus parts as for bad maintance yes but probably not right away just like with any machine..
if parts are left long past there due change date i am sure it could possibly cause one or much worse...
if parts are left long past there due change date i am sure it could possibly cause one or much worse...
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Bad maintenance could cause malfunction of the VIGV /Anti-Stall bleed valve operating and control systems or in the FADEC. Bogus parts in these systems could do the same. Bad maintenance could also result in excessively dirty or worn compressor blades.
Bogus compressor blades could have incorect aerofoil profiles.
Any of these could cause compressor stall.
Bogus compressor blades could have incorect aerofoil profiles.
Any of these could cause compressor stall.
Pegase Driver
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many thankss to both of you, very helpful.
And before you ask, no I am not intending to buy or sell bogus parts, just trying to understand a recent incident.
Tks again.
And before you ask, no I am not intending to buy or sell bogus parts, just trying to understand a recent incident.
Tks again.
I get the impression that you know about as much about aircraft engineering as my cat.
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yah i do know enough about it its just putting it into words with out knowing what he knows is the problem.. that and i am better at talking things out then writing them..
i actualy read a thing about compressor stalls like a day before i saw this post.
i actualy read a thing about compressor stalls like a day before i saw this post.
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Sh!tehawk,
something I was told on my 1st day as an apprentice:
"In this business, there is no such thing as a stupid question."
Everybody has to learn somehow - share the knowledge, it might save your life or 400 other peoples lives one day.....
Best Regards,
N1 Vibes
something I was told on my 1st day as an apprentice:
"In this business, there is no such thing as a stupid question."
Everybody has to learn somehow - share the knowledge, it might save your life or 400 other peoples lives one day.....
Best Regards,
N1 Vibes
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something I was told on my 1st day as an apprentice:
"In this business, there is no such thing as a stupid question."
"In this business, there is no such thing as a stupid question."
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but can anyone with knowledge know if bad maintenance or bogus spare parts can cause/contribute to a compressor stall in a modern Jet engine
Any machine can fail as a result of bad maintenance or bogus spare parts, happens all the time with automobiles and dish washers.
For years now (15-20) the more respectable federal aviation authorities have conducted programs to catch parts that are (bogus) or not overhauled from making it back into the system by mandating that airlines controll parts by maintaining lists of serial numbers and purchase order records for audit.
As far as the bad maintenance goes... Well you get what you pay for.
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Compressor Stall
I worked on the RB 199 , in the Design Office, at Filton with Rolls Royce Ltd.
Position: Senior Design Engineer & Section Leader. I worked under Trevor Laseter, our Group Leader.
It was not uncommon for new aircraft to suffer from Compressor Stall. This rules out Bogus parts theory.
The only factor that I am aware of, is the rate of change of R.P.M. of the spool.
Once up-and-running, at constant R.P.M., a compressor will never stall.
The Engine computer will control rate-of-change of RPM, within prescribed limits.
It is a sticky subject which can only be solved with an Ejector seat, on the Tornado.
However, the end result is always the same. i.e. Brown underpants.
Position: Senior Design Engineer & Section Leader. I worked under Trevor Laseter, our Group Leader.
It was not uncommon for new aircraft to suffer from Compressor Stall. This rules out Bogus parts theory.
The only factor that I am aware of, is the rate of change of R.P.M. of the spool.
Once up-and-running, at constant R.P.M., a compressor will never stall.
The Engine computer will control rate-of-change of RPM, within prescribed limits.
It is a sticky subject which can only be solved with an Ejector seat, on the Tornado.
However, the end result is always the same. i.e. Brown underpants.
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Once up-and-running, at constant R.P.M., a compressor will never stall
It was not uncommon for new aircraft to suffer from Compressor Stall. This rules out Bogus parts theory.
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Compressor Stalls - Causes
The following is from an article I posted on AviationGlossary.com
Typical Causes of Compressor Stalls
Typical Causes of Compressor Stalls
- Excessive fuel flow caused by abrupt engine acceleration when the axial velocity (speed) is reduced by increased pressure in the combustion chamber due to the added combustion and the resultant rotational speed increase
- Operation of the engine outside of its RPM design parameters affecting the rotational speed of the compressor blade
- Turbulent or distorted / disrupted airflow to the engine inlet reducing the axial velocity
- Damage to either the compressor or turbine blades
- Low fuel flow due to abrupt engine deceleration causing a decreased back pressure
- An increase in the vibration level of the engine
- An increase in the Exhaust Gas Temperature -- EGT
- RPM Fluctuations