Increases in Low Speed Response of an IC Engine using a Twin-entry Turbocharger

In this study, one-dimensional analysis using AVL Boost software has been carried out on a series of compression and spark ignition engines utilizing a manufacturer fitted single-entry turbocharger and a modified twin-entry variety, the latter adopting two turbine housing inlet ports.The model reconstruction using AVL Boost considers parameters that accurately represent the physical engine conditions including manifold geometry, turbocharger flow maps and combustion chamber characteristics, etc. Model validations have been made for a manufacturer single-entry turbocharger configuration to predict the maximum engine power and torque, in comparison with available manufacturer data and analytical calculations.Further studies concentrate on engine performance comparisons between single-and twin-entry turbochargers in terms of torque, shaft speed and compressor efficiency and at low engine speed conditions typically in a range of 1000-3000 RPM.It was found that on average engine response has been increased by 27.65%, 5.5%, 5.5% in terms of turbine shaft speed, engine power and torque, respectively, which implies improved "drivability" of the vehicle.This study reveals the potential benefits of adopting a twin-entry turbocharger and the findings would be useful for both industry and academic communities.