Abstract
The idea of using porous media in internal combustion engines is proposed recently for charge homogenization. In this paper, the idea of using metallic porous media instead of ceramic type has been introduced and the macroscopic characteristics of high pressure diesel fuel spray has been studied in interaction with this type of porous media. High speed schlieren imaging method is used to capture the spray development process and evaluate time-dependent characteristics of the spray. The Spray characteristics such as tip penetration and spray projected area has been compared with free spray case and spray interaction with metal PM. Several parameters such as PM pore density, thickness of PM, distance between PM and injector tip has been investigated under different injection and chamber pressures. The results show that interaction with PM could reduce the spray tip velocity and increase spray projected area which proportionally increase the fuel-air mixture homogenization inside the chamber. Post processing of the spray images also indicated that the spray pattern (before and after interaction with PM) strongly depends on the PM pore density and injection pressure.
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