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Old 4th May 2009 | 09:59
  #12 (permalink)  
BelArgUSA
 
Joined: Jun 2005
Posts: 1,420
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From: AEP
When you think about jet engine compressor stalls...

Jet engine compressor stalls...
Axial flow compressors are small airfoil blades. Any airfoils can be stalled.
Angle of attack of the air circulating on that airfoil.
xxx
Compressor stall control - read about compressor variable inlet guide vanes.
See also compressor bleed valves... or variable stator blades (J-79/CJ-805).
All above are controlled by the fuel control unit.
xxx
Also to mention is the location of engines.
Tail mounted engines are often subject to stall because of inlet upsets (from fuselage/wing).
To avoid "compressor stall" (when reducing power to idle for descent) -
My trick with JT3D, JT8D and JT9D, was to operate wing thermal anti-ice.
This bleeds the compressor and seems to help avoid compressor stalls.
This also warmed-up the leading edge flaps reducing their failures... (727-747).
xxx

Happy contrails
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