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Generation Mechanisms of Rotating Stall and Surge in Centrifugal Compressors
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
University of Cambridge, UK.ORCID iD: 0000-0001-7715-863X
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7330-6965
2018 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 100, no 3, p. 705-719Article in journal (Refereed) Published
Abstract [en]

Flow instabilities such as Rotating Stall and Surge limit the operating range of centrifugal compressors at low mass-flow rates. Employing compressible Large Eddy Simulations (LES), their generation mechanisms are exposed. Toward low mass-flow rate operating conditions, flow reversal over the blade tips (generated by the back pressure) causes an inflection point of the inlet flow profile. There, a shear-layer induces vortical structures circulating at the compressor inlet. Traces of these flow structures are observed until far downstream in the radial diffuser. The tip leakage flow exhibits angular momentum imparted by the impeller, which deteriorates the incidence angles at the blade tips through an over imposed swirling component to the incoming flow. We show that the impeller is incapable to maintain constant efficiency at surge operating conditions due to the extreme alteration of the incidence angle. This induces unsteady flow momentum transfer downstream, which is reflected as compression wave at the compressor outlet traveling toward the impeller. There, the pressure oscillations govern the tip leakage flow and hence, the incidence angles at the impeller. When these individual self-exited processes occurs in-phase, a surge limit-cycle establishes.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 100, no 3, p. 705-719
Keyword [en]
Rotating stall, Surge, Centrifugal compressor, Large Eddy Simulations, LES
National Category
Engineering and Technology
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-218399DOI: 10.1007/s10494-017-9877-zISI: 000426863700006Scopus ID: 2-s2.0-85034781553OAI: oai:DiVA.org:kth-218399DiVA, id: diva2:1160754
Funder
Swedish Energy Agency
Note

QC 20171211

Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2018-04-04Bibliographically approved

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