Abstract
The unique properties of porous structures have been utilized in different applications, such as gaseous and liquid fuel burners, to enhance the rate of fuel-air mixing and to increase the thermal efficiency. There have been attempts to utilize these unique features of porous structures to improve the combustion process in direct injection diesel engines as well. In this article, the characteristics of high-pressure diesel sprays directly impinging on the surfaces of porous media (PM) of different pore densities mounted in a constant-volume steel chamber are experimentally investigated. A high-speed imaging technique, designed to capture impingement and egress events at the highest possible frame rates to ensure adequate temporal and spatial resolution for the captured images, is used throughout. The results show that injection pressure and medium pore density have strong influence on the spray patterns above and below the porous medium, streamwise and spanwise spray penetrations, and spray-projected area. The increased projected spray area coupled with multijet splitting following egress from the porous medium is an indication of increased air entrainment and improved degree of air-fuel mixture homogenization.
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