Development of Swirl Generator in Intake Manifold to Increase Engine Performance Port Injection Gasoline Engine
Keywords:
port injection gasoline engine, engine performance, swirl flow.Abstract
The developments for future vehicles are how to reduce fuel consumption, pollutant emission while maintaining high level of engine performance. To deal with those issues, fuel system has been taken great concerns by scientists for a long period of time. As we know, Port Fuel Injection system (PFI) and Gasoline Direct Injection system (GDI) are popular techniques which are being used on commercial vehicles. This paper presents the possible improvement of engine performance by applying swirl generator at port injection gasoline engine. Adding swirl generators to the intake manifold aims to make the airflow more turbulent. The turbulent flow will increase the swirl flow in the combustion chamber. The mixture of fuel with air will also improve. Given these drawbacks, the study analyses the effect of adding a swirl generator to the intake manifold on engine performance, fuel consumption, and emissions produced.
The experiment is done on a port injection gasoline engine, four-stroke, SOHC four cylinder connected to the engine dynamometer, which is used to measure the power and emissions produced. To get a good form of swirl generator, experiments were performed using a flow bench. A method has also been developed simultaneously to quantify the swirl characteristics of a swirl generator under steady flow conditions in a flow laboratory using the cylinder head, intake manifold, and swirl generator from the engine experiments. A refined swirl meter is installed under the cylinder head to measure the compressive load of the swirl, allowing for the calculation of angular momentum of the incoming air at varying intake valve lifts, thus producing the swirl number. A correlation is then sought between the engine and flow experiments to help quantify the impact of swirl motion on combustion and cyclic variation. The airflow rate into the cylinder, discharge coefficient of the intake system, and flow loss coefficient across the blockage are also analyzed for different levels of swirl motion. The validity of this method under steady flow condition is confirmed by comparison of the results with the engine experiments.
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