A Three-Dimensional Compressible Flow Model on Vaneless Diffuser Stall

Abstract

Abstract: A three-dimensional compressible flow model was presented to study the occurrence of rotating waves in vaneless diffusers of centrifugal compressors. Solutions to the discrete 3D Euler equations for compressible flow were obtained via singular value decomposition (SVD) method. Critical inlet mass flow rate of vaneless diffuser stall and relative rotating speed of stall cell were calculated. The effects of inlet Mach number were studied and the results show that both critical inlet mass flow rate and rotating wave speed vary with inlet Mach number especially when the diffuser is long. In addition, critical inlet mass flow rate and rotating wave speed are also influenced by diffuser outlet/inlet radius ratio, departure from axial uniform distribution of the undisturbed radial velocity at the diffuser inlet, and impeller back swept angle. Finally, a comparison with experimental results in open literature was made, and the results of 3D model show better agreement than those of 2D model.

Key words: centrifugal compressor, vaneless diffuser, stall, 3D modeling, compressible flow

CLC Number:

U463.1

References

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收稿日期：20110204

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