On Mixed Flow Turbines for Automotive Turbocharger Applications

Due to increased demands for improved fuel economy of passenger cars, low-end and part-load performance is of key importance for the design of automotive turbocharger turbines. In an automotive drive cycle, a turbine which can extract more energy at high pressure ratios and lower rotational speeds i...

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Main Authors: Bernhardt Lüddecke, Dietmar Filsinger, Jan Ehrhard
Format: Article
Language:English
Published: Hindawi Limited 2012-01-01
Series:International Journal of Rotating Machinery
Online Access:http://dx.doi.org/10.1155/2012/589720
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spelling doaj-3eff1c8cd6514b36b9ea8495b7ae1fb62020-11-25T00:19:38ZengHindawi LimitedInternational Journal of Rotating Machinery1023-621X1542-30342012-01-01201210.1155/2012/589720589720On Mixed Flow Turbines for Automotive Turbocharger ApplicationsBernhardt Lüddecke0Dietmar Filsinger1Jan Ehrhard2IHI Charging Systems International GmbH, Engineering Division, Haberstraße 24, D-69126 Heidelberg, GermanyIHI Charging Systems International GmbH, Engineering Division, Haberstraße 24, D-69126 Heidelberg, GermanyIHI Charging Systems International GmbH, Engineering Division, Haberstraße 24, D-69126 Heidelberg, GermanyDue to increased demands for improved fuel economy of passenger cars, low-end and part-load performance is of key importance for the design of automotive turbocharger turbines. In an automotive drive cycle, a turbine which can extract more energy at high pressure ratios and lower rotational speeds is desirable. In the literature it is typically found that radial turbines provide peak efficiency at speed ratios of 0.7, but at high pressure ratios and low rotational speeds the blade speed ratio will be low and the rotor will experience high values of positive incidence at the inlet. Based on fundamental considerations, it is shown that mixed flow turbines offer substantial advantages for such applications. Moreover, to prove these considerations an experimental assessment of mixed flow turbine efficiency and optimal blade speed ratio is presented. This has been achieved using a new semi-unsteady measurement approach. Finally, evidence of the benefits of mixed flow turbine behaviour in engine operation is given. Regarding turbocharged engine simulation, the benefit of wide-ranging turbine map measurement data as well as the need for reasonable turbine map extrapolation is illustrated.http://dx.doi.org/10.1155/2012/589720
collection DOAJ
language English
format Article
sources DOAJ
author Bernhardt Lüddecke
Dietmar Filsinger
Jan Ehrhard
spellingShingle Bernhardt Lüddecke
Dietmar Filsinger
Jan Ehrhard
On Mixed Flow Turbines for Automotive Turbocharger Applications
International Journal of Rotating Machinery
author_facet Bernhardt Lüddecke
Dietmar Filsinger
Jan Ehrhard
author_sort Bernhardt Lüddecke
title On Mixed Flow Turbines for Automotive Turbocharger Applications
title_short On Mixed Flow Turbines for Automotive Turbocharger Applications
title_full On Mixed Flow Turbines for Automotive Turbocharger Applications
title_fullStr On Mixed Flow Turbines for Automotive Turbocharger Applications
title_full_unstemmed On Mixed Flow Turbines for Automotive Turbocharger Applications
title_sort on mixed flow turbines for automotive turbocharger applications
publisher Hindawi Limited
series International Journal of Rotating Machinery
issn 1023-621X
1542-3034
publishDate 2012-01-01
description Due to increased demands for improved fuel economy of passenger cars, low-end and part-load performance is of key importance for the design of automotive turbocharger turbines. In an automotive drive cycle, a turbine which can extract more energy at high pressure ratios and lower rotational speeds is desirable. In the literature it is typically found that radial turbines provide peak efficiency at speed ratios of 0.7, but at high pressure ratios and low rotational speeds the blade speed ratio will be low and the rotor will experience high values of positive incidence at the inlet. Based on fundamental considerations, it is shown that mixed flow turbines offer substantial advantages for such applications. Moreover, to prove these considerations an experimental assessment of mixed flow turbine efficiency and optimal blade speed ratio is presented. This has been achieved using a new semi-unsteady measurement approach. Finally, evidence of the benefits of mixed flow turbine behaviour in engine operation is given. Regarding turbocharged engine simulation, the benefit of wide-ranging turbine map measurement data as well as the need for reasonable turbine map extrapolation is illustrated.
url http://dx.doi.org/10.1155/2012/589720
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