Development and Matching of Double Entry Turbines for the Next Generation of Highly Boosted Gasoline Engines

Authors

Dipl.-Ing. T. Uhlmann, Dr.-Ing. R. Aymanns,
Dr.-Ing. J. Scharf, FEV GmbH, Aachen; Dipl.-Ing. D. Lückmann, Dipl.-Ing. B. Höpke, RWTH Aachen University; Dipl.-Ing. M. Scassa, FEV Italia S.r.l., Rivoli; Dr.-Ing. N. Schorn, Dr.-Ing. H. Kindl, Ford Forschungszentrum Aachen GmbH, Aachen

Year

2013

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 764

Summary

Downsizing in combination with turbocharging represents the main technology trend for meeting climate relevant CO₂ emission standards in gasoline engine applications. Extended levels of downsizing involve increasing degrees of pulse charging. Separation of cylinder blow downs, either with double entry turbines or valve train variability, is key for achieving enhanced rated power and low-end-torque targets in highly boosted fourcylinder engines. However, double entry turbines feature specific development challenges: The aerodynamic design via 3D CFD calculations presents a difficult task as well as the engine performance modeling and matching process in 1D gas exchange simulations. From a manufacturing standpoint, casting of the turbine housing is complex especially for small displacement applications below 1.6 l due to e. g. thermo-mechanical boundaries.

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