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Variable geometry mixed flow turbine for turbochargers: an experimental study

This paper investigates a variable geometry (VG) mixed flow turbine with a novel, purposely designed pivoting nozzle vane ring. The nozzle vane ring was matched to the 3-dimensional aspect of the mixed flow rotor leading edge with lean stacking. It was found that for a nozzle vane ring in a volute,...

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Main Authors: Rajoo, Srithar, Botas, Ricardo Martinez
Format: Article
Language:English
Published: Japan Science and Technology Information Aggregator, Electronic 2008
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/8477/1/SritarRajoo20008_VariableGepmeteyMixedFlowTurbine.pdf
http://eprints.utm.my/id/eprint/8477/
http://www.jstage.jst.go.jp/browse/ijfms/_vols
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spelling my.utm.84772010-06-02T01:55:30Z http://eprints.utm.my/id/eprint/8477/ Variable geometry mixed flow turbine for turbochargers: an experimental study Rajoo, Srithar Botas, Ricardo Martinez TJ Mechanical engineering and machinery This paper investigates a variable geometry (VG) mixed flow turbine with a novel, purposely designed pivoting nozzle vane ring. The nozzle vane ring was matched to the 3-dimensional aspect of the mixed flow rotor leading edge with lean stacking. It was found that for a nozzle vane ring in a volute, the vane surface pressure is highly affected by the flow in the volute rather than the adjacent vane surface interactions, especially at closer nozzle positions. The performance of the VG mixed flow turbine has been evaluated experimentally in steady and unsteady flow conditions. The VG mixed flow turbine shows higher peak efficiency and swallowing capacity at various vane angle settings compared to an equivalent nozzleless turbine. Comparison with an equivalent straight vane arrangement shows a higher swallowing capacity but similar efficiencies. The VG turbine unsteady performance was found to deviate substantially from the quasi-steady assumption compared to a nozzleless turbine. This is more evident in the higher vane angle settings (smaller nozzle passage), where there are high possibility of choking during a pulse cycle. The presented steady and unsteady results are expected to be beneficial in the design of variable geometry turbochargers, especially the ones with a mixed flow turbine Japan Science and Technology Information Aggregator, Electronic 2008-10 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/8477/1/SritarRajoo20008_VariableGepmeteyMixedFlowTurbine.pdf Rajoo, Srithar and Botas, Ricardo Martinez (2008) Variable geometry mixed flow turbine for turbochargers: an experimental study. International Journal of Fluid Machinery and Systems, 1 (1). pp. 155-168. ISSN 1882-9554 online http://www.jstage.jst.go.jp/browse/ijfms/_vols
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Rajoo, Srithar
Botas, Ricardo Martinez
Variable geometry mixed flow turbine for turbochargers: an experimental study
description This paper investigates a variable geometry (VG) mixed flow turbine with a novel, purposely designed pivoting nozzle vane ring. The nozzle vane ring was matched to the 3-dimensional aspect of the mixed flow rotor leading edge with lean stacking. It was found that for a nozzle vane ring in a volute, the vane surface pressure is highly affected by the flow in the volute rather than the adjacent vane surface interactions, especially at closer nozzle positions. The performance of the VG mixed flow turbine has been evaluated experimentally in steady and unsteady flow conditions. The VG mixed flow turbine shows higher peak efficiency and swallowing capacity at various vane angle settings compared to an equivalent nozzleless turbine. Comparison with an equivalent straight vane arrangement shows a higher swallowing capacity but similar efficiencies. The VG turbine unsteady performance was found to deviate substantially from the quasi-steady assumption compared to a nozzleless turbine. This is more evident in the higher vane angle settings (smaller nozzle passage), where there are high possibility of choking during a pulse cycle. The presented steady and unsteady results are expected to be beneficial in the design of variable geometry turbochargers, especially the ones with a mixed flow turbine
format Article
author Rajoo, Srithar
Botas, Ricardo Martinez
author_facet Rajoo, Srithar
Botas, Ricardo Martinez
author_sort Rajoo, Srithar
title Variable geometry mixed flow turbine for turbochargers: an experimental study
title_short Variable geometry mixed flow turbine for turbochargers: an experimental study
title_full Variable geometry mixed flow turbine for turbochargers: an experimental study
title_fullStr Variable geometry mixed flow turbine for turbochargers: an experimental study
title_full_unstemmed Variable geometry mixed flow turbine for turbochargers: an experimental study
title_sort variable geometry mixed flow turbine for turbochargers: an experimental study
publisher Japan Science and Technology Information Aggregator, Electronic
publishDate 2008
url http://eprints.utm.my/id/eprint/8477/1/SritarRajoo20008_VariableGepmeteyMixedFlowTurbine.pdf
http://eprints.utm.my/id/eprint/8477/
http://www.jstage.jst.go.jp/browse/ijfms/_vols
_version_ 1643644998493667328
score 13.211869

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