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Performance prediction of a mixed flow turbine

Published online by Cambridge University Press:  17 May 2008

Miloud Abidat ,
Mohammed Kamel Hamidou ,
Madjid Hachemi ,
Mohammed Hamel  and
Sid Ali Litim
Miloud Abidat
Affiliation:
Laboratoire de Mécanique Appliquée, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d'Oran, BP 1505, Oran El M'Naouer, 31000 Oran, Algeria
Mohammed Kamel Hamidou
Affiliation:
Laboratoire de Mécanique Appliquée, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d'Oran, BP 1505, Oran El M'Naouer, 31000 Oran, Algeria
Madjid Hachemi
Affiliation:
Laboratoire de Mécanique Appliquée, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d'Oran, BP 1505, Oran El M'Naouer, 31000 Oran, Algeria
Mohammed Hamel
Affiliation:
Laboratoire de Mécanique Appliquée, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d'Oran, BP 1505, Oran El M'Naouer, 31000 Oran, Algeria
Sid Ali Litim
Affiliation:
Laboratoire de Mécanique Appliquée, Faculté de Génie Mécanique, Université des Sciences et de la Technologie d'Oran, BP 1505, Oran El M'Naouer, 31000 Oran, Algeria
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Abstract

Turbochargers are widely used in Diesel engines as a means of increasing the output power. Most of them are fitted with radial or mixed flow turbines. In applications where high boost pressure is required, radial turbines are replaced with mixed flow turbines with positive rotor inlet blade angle so that they can achieve a maximum efficiency at a lower value of blade speed to isentropic expansion velocity ratio than the usual 0.7 (for radial turbines). This study, performed with the ICEM and CFX softwares of ANSYS, presents a numerical performance prediction of a mixed flow turbine for a wide range of rotational speeds and pressure ratios. The influence of the clearance between the rotor tip blades and the casing on the turbine performances is also investigated. A simulation of the turbine under pulsed inlet flow conditions is also presented.

Keywords

Mixed flow turbineperformanceturbochargerfinite volume methodefficiencypulsating flowTurbines semi-axialesperformanceturbocompresseurméthode des volumes finisrendementécoulement pulsé
Type
Research Article
Information
Mechanics & Industry , Volume 9 , Issue 1 , January 2008 , pp. 71 - 79
Copyright
© AFM, EDP Sciences, 2008

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