A Three-dimensional Model on Rotating Stall in Unparallel Wall Vaneless Diffusers

Abstract

Abstract: A 3D model wass presented to study the occurrence of weak rotating waves in unparallel wall vaneless diffusers in centrifugal compressors. The undisturbed flow was first calculated by strongly implicit procedure (SIP), and the discrete linearlised 3D compressible Euler equations were then solved employing singular value decomposition (SVD) technique. The critical inlet mass flow rate for rotating stall and the relative rotating wave speed were predicted. Three different shapes of shroud wall: convergent, convergent and divergent, and constant area tapered shroud walls were studied. The results show the suppression effects on rotating stall of diffusers with contracting shaped shroud walls, especially of long diffusers. The critical mass flow rate also varies with inlet Mach number and diffuser outlet/inlet radius ratio. The results from the model developed agree qualitatively well with those in open literatures.

Key words: centrifugal compressor, vaneless diffuser, unparallel wall, stall, 3D modeling

CLC Number:

TH45

References

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