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An Integrated Turbocharger Matching Program for Internal Combustion Engines
Author(s): Sepehr Mousavi, Amir Nejat, Seyed Shahabeddin Alaviyoun, Mohammad Nejat
Keywords: Internal Combustion Engine, Turbocharger Matching, Engine Performance Simulation, Zero-dimensional Simulation, Engine Downsizing
Following the global environmental concerns, many automobile manufacturers are trying to produce smaller engines, aiming to lower emission and lower fuel consumption. As compensation for performance reduction, these engines are equipped with turbochargers. One of the challenges is to select the right turbocharger for a specific engine. In this regard, an integrated zero-dimensional turbocharger and engine simulation program is developed, employing a quasi-steady compressible flow method. The program gives the designer the possibility of observing the performance of different compressor-turbine combinations on an internal combustion engine. Engine details such as fuel, cylinder geometry, heat transfer conditions, valve timing, and spark timing are considered within the engine modeling, and the designer can investigate their effects on the overall performance of the system. Compressor and turbine performances are predicted by their previously provided performance maps (steady-state characteristics) and special inter- and extrapolation methods. A new algorithm for turbocharger matching is suggested, and its logics, basic convergence loops, and thermodynamic equations have been described in detail. A database containing digitized compressor and turbine maps and details provided by different manufacturers is created and integrated into the program. An existing turbocharged engine has been tested and also simulated by the program. The accuracy of the program results is evaluated by comparing them with experimental results. The maximum error of modeling the engine and the maximum error the whole simulation are 1.5% and 16%, respectively.