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research-article

Correcting Turbocharger Performance Maps for Heat Transfer and Friction

[+] Author and Article Information
Mario Schinnerl

Continental Automotive GmbH, D-93055 Regensburg, Germany
mario.schinnerl@continental-corporation.com

Jan Ehrhard

Continental Automotive GmbH, D-93055 Regensburg, Germany
jan.ehrhard@continental-corporation.com

Mathias Bogner

Continental Automotive GmbH, D-93055 Regensburg, Germany
mathias.bogner@continental-corporation.com

Joerg R. Seume

Institute of Turbomachinery and Fluid Dynamics, Leibniz Universitaet Hannover, D-30511 Hannover, Germany
seume@tfd.uni-hannover.de

1Corresponding author.

ASME doi:10.1115/1.4037586 History: Received July 03, 2017; Revised July 05, 2017

Abstract

The measured performance maps of turbochargers which are commonly used for the matching process with a combustion engine are influenced by heat transfer and friction phenomena. Internal heat transfer from the hot turbine side to the colder compressor side leads to an apparently lower compressor efficiency at low to mid speeds and is not comparable to the compressor efficiency measured under adiabatic conditions. The product of the isentropic turbine efficiency and the mechanical efficiency is typically applied to characterize the turbine efficiency and results from the power balance of the turbocharger. This so-called 'thermo-mechanical' turbine efficiency is strongly correlated with the compressor efficiency obtained from measured data. Based on a previously developed one-dimensional heat transfer model, non-dimensional analysis was carried out and a generally valid heat transfer model for the compressor side of different turbochargers was developed. From measurements and ramp-up simulations of turbocharger friction power, an analytical friction power model was developed to correct the thermo-mechanical turbine efficiency from friction impact. The developed heat transfer and friction model demonstrates the capability to properly predict the adiabatic (aerodynamic) compressor and turbine performance from measurement data obtained at a steady-flow hot gas test bench.

Copyright (c) 2017 by ASME
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