Development of a criterion for a robust identification of diffuser rotating stall onset in industrial centrifugal compressors

[+] Author and Article Information
Alessandro Bianchini

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy

Giulia Andreini

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy

Lorenzo Ferrari

Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, Largo Lucio Lazzarino, 56122, Pisa, Italy

Dante Tommaso Rubino

Dante Tommaso Rubino – Baker Hughes, a GE company, Via Felice Matteucci 10, 50127, Firenze, Italy

Giovanni Ferrara

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy

1Corresponding author.

ASME doi:10.1115/1.4040863 History: Received June 26, 2018; Revised July 04, 2018


Recent studies showed that a prompt detection of the stall inception, connected with a specific model to predict the associated aerodynamic force, could provide room for an extension of the left margin of the operating curve of centrifugal compressors. In industrial machines working in the field, however, robust procedures to detect and identify the phenomenon are still missing, i.e. the operating curve is cut preliminary by the manufacturer by a proper safety margin; moreover, no agreement is found in the literature about a well-defined threshold to identify the onset of the stall. In some cases the intensity of the arising subsynchronous frequency is compared to the revolution frequency, while in many others it is compared to the blade passage frequency. A large experience in experimental stall analyses collected by the authors revealed that in some cases unexpected spikes could make this direct comparison not reliable for a robust automatic detection. To this end, a new criterion was developed based on an integral analysis of the area subtended to the entire subsynchronous spectrum of the dynamic pressure signal of probes positioned just outside the impeller exit. A dimensionless parameter was defined to account for the spectrum area increase in proximity to stall inception. This new parameter enabled the definition of a reference threshold to highlight the arising of stall conditions, whose validity and increased robustness was verified based on a set of experimental analyses of different full-stage test cases of industrial centrifugal compressors at the test rig.

Copyright (c) 2018 by ASME
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