Dynamic Mode Decomposition Analysis of the Unsteady Flow in a Centrifugal Compressor Volute
Publication: Journal of Aerospace Engineering
Volume 32, Issue 1
Abstract
The volute has a significant effect on the unsteady characteristics of the centrifugal compressor. The flow in the centrifugal compressor volute is unsteady and complex. In this paper, the dynamic mode decomposition (DMD) method is used to extract the most dominant flow structures in a turbocharger centrifugal compressor volute under design and mild surge conditions. Large-scale perturbations with synchronic frequencies corresponding to the shaft rotating speed are correctly captured. In addition, nonsynchronic frequency and flow mode in the volute are illustrated. The results show that the high-frequency unsteady flow mode corresponding to the main and splitter blade passing becomes weak in the volute. The development of the unsteady flow mode at the mild surge condition is vividly shown by the reconstruction. Two clear cells in the vaneless diffuser occur under the influence of the volute.
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 13, 2017
Accepted: Jun 15, 2018
Published online: Nov 9, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 9, 2019
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