Large Eddy Simulation of the Unsteady Flow in a Radial Compressor Operating Near Surge
2012 (English)In: Journal of turbomachinery, ISSN 0889-504X, Vol. 134, no 5, 051006- p.Article in journal (Refereed) Published
The flow in a centrifugal compressor has been computed using large eddy simulation (LES). The investigated geometry is that of a ported shroud compressor with a 10 blade impeller with an exducer diameter of 88 mm. The computational data compares favorably with measured data for the same compressor and operational point. For the considered operational point near surge, the flow field in the entire compressor stage is unsteady. Back-flow occurs in the diffuser, wheel, and the ported shroud channels resulting in back-flow at the walls in the inlet region of the compressor. In the diffuser and volute, the flow is highly unsteady with perturbations that are convected around the volute, affecting the flow field in most of the entire compressor. The mechanism driving this unsteadiness is assessed by flow visualizations, frequency analysis, and correlations of pressure and velocity data in order to gain a more comprehensive understanding of the mechanism leading to stall and surge.
Place, publisher, year, edition, pages
2012. Vol. 134, no 5, 051006- p.
Blade impeller, Compressor stage, Computational data, Frequency Analysis, Measured data, Radial compressors
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-12741DOI: 10.1115/1.4003816ISI: 000308404500006ScopusID: 2-s2.0-84860681469OAI: oai:DiVA.org:kth-12741DiVA: diva2:318484
FunderSwedish e‐Science Research Center
QC 20120621. Updated from manuscript to article in journal.2010-05-072010-05-072013-04-08Bibliographically approved