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Effect of Injector Nozzle Finish on Performance and Emissions in a HSDI, Light-duty, Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
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The purpose of this study was to determine the effect of injector nozzle hole size, shape, and finish on performance and emissions in a light-duty diesel engine. Two sets of six-hole valve covered orifice (VCO) nozzles were tested with nearly identical volumetric flow rates but varying geometry and finish. The 17% hydro-erosion (HE) nozzles had a 22% larger discharge coefficient (CD), compared to the 7% HE nozzles. In order to maintain similar volumetric flow rates, the orifice diameter of the 17% HE nozzles were reduced by almost 10%.The nozzles were tested in a 1.7L, four-cylinder, common rail diesel engine, operating on conventional D2 diesel fuel. The 17% HE, conical-shaped nozzles reduced fuel specific particulate matter (PM) and increased fuel specific oxides of nitrogen (NOx) emissions, over the 7% HE, straight-shaped nozzle. In-cylinder visualization showed a consistent trend toward reduced late-cycle soot concentration with the 17% HE nozzles which trended with engine-out soot.
CitationMiers, S. and Ciatti, S., "Effect of Injector Nozzle Finish on Performance and Emissions in a HSDI, Light-duty, Diesel Engine," SAE Technical Paper 2006-01-0200, 2006, https://doi.org/10.4271/2006-01-0200.
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