Modeling Of SI Engine Modification for Higher Ethanol Blended Gasoline Engine Applications: Part I - Parametric Study Using Port Flow Simulation
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In the search for alternative fuels for transportation and emission reduction, internal combustion (IC) engine downsizing and utilization of higher ethanol blended fuel are the best candidates. Downsizing and utilization of higher ethanol blending method decrease fuel consumption as well as reduces emissions significantly. An efficient IC engine can be achieved by controlling the pre-combustion phenomena like swirl and tumble, which are best for uniform air-fuel mixture and convenient for efficient combustion. An intake modification system was used to inject higher ethanol content into the intake port of a single cylinder four stroke Spark Ignition (SI) engine that has been studied using Computational fluid dynamics (CFD). An engine modification at the inlet port has been inserted to increase the swirl and tumble ratios. The in-port utility with port fuel injection (PFI) contains three-swirl blades to achieve a swirl velocity component with minimum pressure drop expense during suction. Port flow simulation (PFS) for a model engine of single cylinder four stroke SI engine predicted fluid dynamics and airflow rate within the cylinder during the suction process. Comparisons have been made for models with and without in-port utility for an IC engine using ANSYS/ICE modeling package and found a significant improvement on in-cylinder swirl and tumble turbulence that affect the combustion process. An inport utility design with port fuel injection (PFI) with 30mm length, 90mm pitch and blade radial length (BRL) of 10mm related with 2/3 of radius of the inlet valve has shown the best alternative in the design parametric study.