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Int. J. Turbomach. Propuls. Power 2017, 2(4), 19;

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

Royal Institute of Technology (KTH), Department of Mechanics, Competence Center for Gas Exchange (CCGEx), Osquars backe 18, SE-10044 Stockholm, Sweden
Baker Hughes, a GE company, 50127 Florence, Italy
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Proceedings of the European Turbomachinery Conference ETC12 2017, Paper No. 175.
Academic Editor: Marcello Manna
Received: 3 October 2017 / Revised: 21 November 2017 / Accepted: 24 November 2017 / Published: 28 November 2017
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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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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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Int. J. Turbomach. Propuls. Power EISSN 2504-186X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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