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Modelling of Unsteady Flow Test Rig Operation of Exhaust Turbocharger Turbines
Published January 01, 1990 by Associazione Tecnica Dell'Automobile in Italy
Unsteadiness of induction and exhaust processes represents a very important aspect in design and optimization of internal combustion engines. Particularly in the case of small high-speed multicylinder turbocharged engines, a theoretical and experimental investigation on unsteady flow behaviour of specific devices (e.g. radial turbines and compressors) can improve matching calculations.
A simulation model of an original pulsating flow generator system, recently set up on the turbocharger test rig of the Department of Energetic Engineering of the University of Genoa, is presented in the paper. This model, based on the method of characteristics, allows to evaluate the periodic fluctuations of pressure, temperature and mass flow in each station of the system. A first comparison between theoretical and experimental data is here reported. The good agreement of results is encouraging to further future developments.