Stringent emission standards are driving the development of diesel-fuel injection concepts to mitigate in-cylinder formation of particulates. While research has demonstrated significant reduction in particulate formation using micro-orifice technology, implementation requires development of industrial processes to fabricate micro-orifices with diameters as low as 50 μm and with large length-to-diameter ratios. This paper reviews the different processes being pursued to fabricate micro-orifices and the advanced techniques applied to characterize the performance of micro-orifices. The latter include the use of phase-contrast x-ray imaging of electroless nickel-plated micro-orifices and laser imaging of fuel sprays at elevated pressures. The experimental results demonstrate an industrially viable process to create small uniform orifices that improve spray formation for fuel injection.
Fabrication and Characterization of Micro-Orifices for Diesel Fuel Injectors
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
2008 SAE International Powertrains, Fuels and Lubricants Congress ; 2008
Sae International Journal of Fuels and Lubricants ; 1 , 1 ; 910-919
2008-06-23
10 pages
Conference paper
English
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