REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

computational fluid dynamics of the turbulent air flow through a vaned diffuser turbocharger

abdelmadjid chehhat

Mechanical engineering department, Faculty of technology, Abbes Laghrour University, Khenchela(40000), Algeria, achehhat@gmail.com

mohamed si-ameur

Laboratory of Energetic and Industrial Systems, University of Batna(05000), Algeria, msiameur@yahoo.fr

Abstract: In this work a numerical study with moving reference frame (MRF) technique is made. Many research works both experimental and numerical on the impeller-diffuser interactive phenomenon have been undertaken so far. But it is found from the literature that the study on the impeller-diffuser-volute interaction as well on the performance of the turbocharger centrifugal compressor by varying the number of diffuser vanes has not been the focus of attention in these works. Hence a numerical analysis was accomplished in order to extensively explore impeller-diffuser fluid interaction in a real turbocharger used in military engines applications, when the number of diffuser vanes was changed at unaltered number of the impeller blades. It was concluded that the number of diffuser vanes gives a considerable effect on the pressure and temperature at the compressor outlet.

Keywords: centrifugal compressor, turbocharger, diffuser vanes, CFD analysis.