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Int. J. Turbomach. Propuls. Power 2017, 2(4), 19; https://doi.org/10.3390/ijtpp2040019

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

1
Royal Institute of Technology (KTH), Department of Mechanics, Competence Center for Gas Exchange (CCGEx), Osquars backe 18, SE-10044 Stockholm, Sweden
2
Baker Hughes, a GE company, 50127 Florence, Italy
This paper is an extended version of our paper published in Proceedings of the European Turbomachinery Conference ETC12 2017, Paper No. 175.
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Manna
Received: 3 October 2017 / Revised: 21 November 2017 / Accepted: 24 November 2017 / Published: 28 November 2017
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Abstract

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. View Full-Text
Keywords: diffuser stall; centrifugal compressor; Large Eddy Simulations diffuser stall; centrifugal compressor; Large Eddy Simulations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sundström, E.; Mihăescu, M.; Giachi, M.; Belardini, E.; Michelassi, V. Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor. Int. J. Turbomach. Propuls. Power 2017, 2, 19.

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