Analysis of the Unsteady Flow Field in a Centrifugal Compressor from Peak Efficiency to Near Stall with Full-Annulus Simulations
Joint Authors
Binder, Nicolas
Bousquet, Yannick
Dufour, Guillaume
Trebinjac, Isabelle
Carbonneau, Xavier
Source
International Journal of Rotating Machinery
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-01-16
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
This study concerns a 2.5 pressure ratio centrifugal compressor stage consisting of a splittered unshrouded impeller and a vaned diffuser.
The aim of this paper is to investigate the modifications of the flow structure when the operating point moves from peak efficiency to near stall.
The investigations are based on the results of unsteady three-dimensional simulations, in a calculation domain comprising all the blade.
A detailed analysis is given in the impeller inducer and in the vaned diffuser entry region through time-averaged and unsteady flow field.
In the impeller inducer, this study demonstrates that the mass flow reduction from peak efficiency to near stall leads to intensification of the secondary flow effects.
The low momentum fluid accumulated near the shroud interacts with the main flow through a shear layer zone.
At near stall condition, the interface between the two flow structures becomes unstable leading to vortices development.
In the diffuser entry region, by reducing the mass flow, the high incidence angle from the impeller exit induces a separation on the diffuser vane suction side.
At near stall operating point, vorticity from the separation is shed into vortex cores which are periodically formed and convected downstream along the suction side.
American Psychological Association (APA)
Bousquet, Yannick& Carbonneau, Xavier& Dufour, Guillaume& Binder, Nicolas& Trebinjac, Isabelle. 2014. Analysis of the Unsteady Flow Field in a Centrifugal Compressor from Peak Efficiency to Near Stall with Full-Annulus Simulations. International Journal of Rotating Machinery،Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-494042
Modern Language Association (MLA)
Bousquet, Yannick…[et al.]. Analysis of the Unsteady Flow Field in a Centrifugal Compressor from Peak Efficiency to Near Stall with Full-Annulus Simulations. International Journal of Rotating Machinery No. 2014 (2014), pp.1-11.
https://search.emarefa.net/detail/BIM-494042
American Medical Association (AMA)
Bousquet, Yannick& Carbonneau, Xavier& Dufour, Guillaume& Binder, Nicolas& Trebinjac, Isabelle. Analysis of the Unsteady Flow Field in a Centrifugal Compressor from Peak Efficiency to Near Stall with Full-Annulus Simulations. International Journal of Rotating Machinery. 2014. Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-494042
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-494042