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A model for the selective amplification of spatially coherent waves in a centrifugal compressor on the verge of rotating stallA simple model for the stability zones of a low speed centrifugal compressor is developed, with the goal of understanding the driving mechanism for the changes in stalling behavior predicted for, and observed in, the Purdue Low Speed Centrifugal Research Compressor Facility. To this end, earlier analyses of rotating stall suppression in centrifugal compressors are presented in a reduced form that preserves the essential parameters of the model that affect the stalling behavior of the compressor. The model is then used to illuminate the relationship between compressor geometry, expected mode shape, and regions of amplification for weak waves which are indicative of the susceptibility of the system to rotating stall. The results demonstrate that increasing the stagger angle of the diffuser vanes, and consequently the diffusion path length, results in the compressor moving towards a condition where higher-order spatial modes are excited during stall initiation. Similarly, flow acceleration in the diffuser section caused by an increase in the number of diffuser vanes also results in the excitation of higher modes.
Document ID
19930066042
Document Type
Conference Paper
Authors
Lawless, Patrick B. (NASA Lewis Research Center Cleveland, OH, United States)
Fleeter, Sanford (Purdue Univ. West Lafayette, IN, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Subject Category
AERODYNAMICS
Report/Patent Number
AIAA PAPER 93-2236
Meeting Information
AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference and Exhibit(Monterey, CA)
Distribution Limits
Public
Copyright
Other