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Numerical study on the Effect of Interaction Vaned Diffuser with Impeller on the Performance of a Modified Centrifugal Compressor

Published online by Cambridge University Press:  07 August 2013

L. H. Jawad ,
S. Abdullah ,
R. Zulkifli  and
W. M. F. W. Mahmood
L. H. Jawad*
Affiliation:
Foundation of Technical Education, Ministry of Higher Education and Scientific Research, Iraq Department of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, The National University of Malaysia, Malaysia, Ukm Bangi, Selangor, Malaysia
S. Abdullah
Affiliation:
Department of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, The National University of Malaysia, Malaysia Ukm Bangi, Selangor, Malaysia
R. Zulkifli
Affiliation:
Department of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, The National University of Malaysia, Malaysia Ukm Bangi, Selangor, Malaysia
W. M. F. W. Mahmood
Affiliation:
Department of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, The National University of Malaysia, Malaysia Ukm Bangi, Selangor, Malaysia
*
*Laihasan@yahoo.com
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Abstract

This paper is a numerical simulation that was made in the three-dimensional flow, carried out in a modified centrifugal compressor, having vaned diffuser stage, used as an auto-motive turbo charger. Moreover, the performance of the centrifugal compressor was dependent on the proper matching between compressor impeller and vaned diffuser, influencing significantly surge and the efficiency of centrifugal compressor stages. In addition, a modified compressor impeller, coupled with vane and vaneless diffuser, has been found to have similar internal flow patterns for both the vaneless and vaned diffuser design. The vaned diffuser effect has been paid particular attention in terms of better analysis where the diffuser was designed for high sub-sonic inlet conditions. Another aim of this research was to study and simulate the effect of vaned diffuser on the performance of a centrifugal compressor. The simulation was undertaken by using a commercial software, the so-called ANSYS CFX, to predict numerically the performance in terms of pressure ratio, poly tropic efficiency and mass flow rate for the centrifugal compressor stage. The results were generated from CFD and were analyzed for better understanding of the fluid flow through centrifugal compressor stage. Conclusively, it was observed that the effect of the vaned diffuser is to convert the kinetic energy into a high static pressure after analyzing the results of the simulation.

Keywords

Numerical studyCentrifugal compressor performanceVaned diffuserCFD
Type
Research Article
Information
Journal of Mechanics , Volume 30 , Issue 2 , April 2014 , pp. 113 - 121
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2013 

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