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Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor
KTH, School of Engineering Sciences (SCI), Mechanics. (Competence Centrer for Gas Exchange (CCGEx))
KTH, School of Engineering Sciences (SCI), Mechanics. (Competence Center for Gas Exchange (CCGEx), FLOW)ORCID iD: 0000-0001-7330-6965
Baker Hughes, a GE Company.
Baker Hughes, a GE Company.
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2017 (English)In: International Journal of Turbomachinery Propulsion and Power, E-ISSN EISSN 2504-186X, Vol. 2, no 4Article in journal (Refereed) Published
Abstract [en]

Numerical simulations based on the large eddy simulation approach were conducted with the aim to explore vaneless diffuser rotating stall instability in a centrifugal compressor. The effect of the impeller blade passage was included as an inlet boundary condition with sufficiently low flow angle relative to the tangent to provoke the instability and cause circulation in the diffuser core flow. Flow quantities, velocity and pressure, were extracted to accumulate statistics for calculating mean velocity and mean Reynolds stresses in the wall-to-wall direction. The paper focuses on the assessment of the complex response of the system to the velocity perturbations imposed, the resulting pressure gradient and flow curvature effects.

Place, publisher, year, edition, pages
Basel, Switzerland, 2017. Vol. 2, no 4
Keywords [en]
diffuser stall, centrifugal compressor, Large Eddy Simulations
National Category
Engineering and Technology
Research subject
Engineering Mechanics
URN: urn:nbn:se:kth:diva-218469DOI: 10.3390/ijtpp2040019Scopus ID: 2-s2.0-85021790927OAI:, id: diva2:1160996

QC 20171211

Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2017-12-11Bibliographically approved

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