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Compressor Stall

 Compressor Stall

  • There are three distinct stall phenomena. Rotating stall and individual blade stall are aerodynamic phenomena. Stall flutter is an aeroelastic phenomenon.
Individual Blade Stall
  • This type of stall occurs when all the blades around the compressor annulus stall simultaneously without the occurrence of a stall propagation mechanism.
  • The circumstances under which individual blade stall is established are unknown at present. It appears that the stalling of a blade row generally manifests itself in some type of propagating stall and that individual blade stall is an exception.
Rotating Stall
  • Rotating, or propagating stall, was first observed by Whittle and his team on the inducer vanes of a centrifugal compressor.
  •  Rotating stall (propagating stall) consists of large stall zones covering several blade passages and propagates in
  • the direction of the rotation and at some fraction of rotor speed.
  •  The number of stall zones and the propagating rates vary considerably. Rotating stall is the most prevalent type of stall phenomenon.
  • The propagation mechanism can be described by considering the blade row to be a cascade of blades.
  • A flow perturbation causes blade 2 to reach a stalled condition before the other blades.
  • This stalled blade does not produce a sufficient pressure rise to maintain the flow around it, and an
  • effective flow blockage or a zone of reduced flow develops.

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