A detailed one-dimensional model to predict the unsteady behavior of turbocharger turbines for internal combustion engine applications

This article describes an investigation of the unsteady behavior of turbocharger turbines by one-dimensional modeling and experimental analysis. A one-dimensional model has been developed to predict the performance of a vaneless radial-inflow turbine submitted to unsteady flow conditions. Different...

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Bibliographic Details
Published in:International journal of engine research 2019-03, Vol.20 (3), p.327-349
Main Authors: Piscaglia, Federico, Onorati, Angelo, Marelli, Silvia, Capobianco, Massimo
Format: Article
Language:English
Subjects:
Computer simulation
Dimensional analysis
Electrical impedance
Inflow
Internal combustion engines
Mathematical models
Model accuracy
Modelling
One dimensional models
Superchargers
Turbines
Unsteady flow
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Summary:This article describes an investigation of the unsteady behavior of turbocharger turbines by one-dimensional modeling and experimental analysis. A one-dimensional model has been developed to predict the performance of a vaneless radial-inflow turbine submitted to unsteady flow conditions. Different from other approaches proposed in the literature, the turbine has been simulated by separating the effects of casing and rotor on the unsteady flow and by modeling the multiple rotor entries from the volute. This is a simple and effective way to represent the turbine volute by a network of one-dimensional pipes, in order to capture the mass storage effect due to the system volume, as well as the circumferential variation of fluid dynamic conditions along the volute, responsible for variable admittance of mass into the rotor through blade passages. The method developed is described, and the accuracy of the one-dimensional model is shown by comparing predicted results with measured data, achieved on a test rig dedicated to the investigation of automotive turbochargers. The validation of the code is presented and an analysis of the flow unsteadiness, based on a variety of parameters, is proposed.
ISSN:1468-0874
2041-3149
DOI:10.1177/1468087417752525