Stall Inception in a High Speed Centrifugal Compressor During Speed Transients

[+] Author and Article Information
Fangyuan Lou

Purdue University, 500 Allison Road, West Lafayette, IN 47907

John C. Fabian

Purdue University, 500 Allison Road, West Lafayette, IN 47907

Nicole L. Key

Professor, Purdue University, 500 Allison Road, West Lafayette, IN 47907

1Corresponding author.

ASME doi:10.1115/1.4037759 History: Received August 15, 2017; Revised August 17, 2017


The inception and evolution of rotating stall in a high-speed centrifugal compressor are characterized during speed transients. Experiments were performed in the Single Stage Centrifugal Compressor (SSCC) facility at Purdue University and include speed transients from sub-idle to full speed at different throttle settings while collecting transient performance data. Results show a substantial difference in the compressor transient performance for accelerations versus decelerations. This difference is associated with the heat transfer between the flow and the hardware. The heat transfer from the hardware to the flow during the decelerations locates the compressor operating condition closer to the surge line and results in a significant reduction in surge margin during decelerations. Additionally, data were acquired from fast-response pressure transducers along the impeller shroud, in the vaneless space, and along the diffuser passages. Two different patterns of flow instabilities, including mild surge and short-length-scale rotating stall, are observed during the decelerations. The instability starts with a small pressure perturbation at the impeller leading edge and quickly develops into a single-lobe rotating stall burst. The stall cell propagates in the direction opposite of impeller rotation at approximately one third of the rotor speed. The rotating stall bursts are observed in both the impeller and diffuser, with the largest magnitudes near the diffuser throat. Furthermore, the flow instability develops into a continuous high frequency stall and remains in the fully developed stall condition.

Copyright (c) 2017 by ASME
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