To maintain stable operation, centrifugal compressors require a sufficient surge margin to avoid instabilities caused by small deviations in operating point or inlet conditions. When the operating point of a compressor nears the surge line, two unstable flow behaviors may exist - rotating stall and surge. The recent efforts in stall control have focused on the suppression of a single resonant mode, or stall cell pattern, to achieve range extension. A critical limitation of these techniques has been the eruption of higher order modes after the successful control of the first stall mode. To address this issue, experiments have been performed at Purdue University to investigate the feasibility of passive control of multi-mode rotating stall in centrifugal compressors. This is accomplished through experiments directed at characterizing the onset of rotating stall under the influence of a passive-dynamic multi-mode control scheme implemented in the Purdue Low Speed Centrifugal Compressor (PLCC).
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