NDLI: Optical Investigation Into Wall Wetting From Late-Cycle Post-Injections Used for Diesel Particulate Filter Regeneration

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bozic, Goran Kook, Sanghoon Isaac, W. Ekoto Ben, R. Petersen Paul, C. Miles
Copyright Year	2010
Abstract	Wall wetting phenomena were investigated in a light-duty diesel optical engine operating under typical diesel particulate filter regeneration conditions through the use of liquid spray imaging during late-cycle post-injections. Three post-injection timings were explored: 1) an ‘early’ timing (44.5°aTDC) where high ambient temperatures and densities were expected to decrease the liquid penetration, 2) a ‘conventional’ timing (78.5°aTDC) that is typically used to produce the necessary aftertreatment regeneration exhaust conditions, and 3) a ‘late’ timing (133.5°aTDC) where in-cylinder flows generated by exhaust valve opening-induced blowdown can disrupt the liquid penetration. In addition to a 2007 US certification diesel fuel, a palm-derived B20 biodiesel blend and soy-derived B100 biodiesel were examined since liquid spray impingement is thought to worsen for biodiesel blends due to the higher fuel distillation temperature, density, and viscosity. No significant wall wetting was observed for the early post-injection. However, considerable impingement occurred for the conventional and late post-injections. Liquid penetration and the persistence of liquid fuel in the cylinder were found to increase with biodiesel content, while exhaust blowdown flows were ineffective in reducing the severity of wall wetting. Negligible distortion of jet structure was observed for the liquid spray at the late post-injection. Short pulse durations decreased the severity of liquid penetration with the soy-derived biodiesel during the early post-injection SOI, but were otherwise ineffective.
Sponsorship	Internal Combustion Engine Division
Starting Page	507
Ending Page	516
Page Count	10
File Format	PDF
ISBN	9780791849446
DOI	10.1115/ICEF2010-35075
e-ISBN	9780791838822
Conference Proceedings	ASME 2010 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2010-09-12
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Viscosity Cycles Temperature Wetting Silicon-on-insulator Sprays Valves Fuels Biodiesel Flow (dynamics) Density Engines Exhaust systems Filters Particulate matter Imaging Diesel Cylinders
Content Type	Text
Resource Type	Article

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