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This paper reports a numerical study on the process from normal operating conditions to rotating stall in a cen-trifugal compressor with vaned diffuser.The purpose is to better understand the flow characteristics near stallpoint under the interactions between centrifugal impeller and vaned diffuser.Numerical results show that undercertain conditions just preceding stall point the tip leakage vortex begins to fluctuate at roughly half of the bladepassing frequency.This phenomenon is similar to rotating instability in axial compressors.With the flow rate re-duced further the impeller stalls and five stall cells propagating at a frequency of 85 percent of impeller rotationspeed are found.
This paper reports a numerical study on the process from normal operating conditions to rotating stall in a cen-trifugal compressor with vaned diffuser. The purpose is to better understand the flow characteristics near stallpoint under the interactions between centrifugal impeller and vaned diffuser. Numerical results show that under under conditions of just preceding stall point the tip leakage vortex begins to fluctuate at roughly half of the blade pass frequency. This phenomenon is similar to rot inst instability in axial compressors. Where the flow rate re-duced further impeller stalls and five stall cells propagating at a frequency of 85 percent of impeller rotationspeed are found.