Experimental Investigation of Smoke Emission Dependent upon Engine Operating Conditions

Han, Sung Bin; Hinze, P.; Kwon, Young Jik; Mun, Sung Soo

doi:10.4271/971658

Cited by 2 publications

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“…The reason for the correlation gap observed here, and the way that it reduces with increasing PMBF, may be related in part to soot radiative heat losses. It has been reported that as the relative proportion of diffusion burning increases soot emissions also increase. ,, This being understood, and assuming at least some degree of correlation between soot emissions and in-cylinder soot, it is possible to conceive of the following hypothesis: For a large PMBF, in-cylinder soot quantities might be low when fuelling with both ULSD and RME, meaning comparable radiative heat losses, and the tendency to generate lesser differences in NO x emissions for similar combustion behavior. For a reduced PMBF, in-cylinder soot quantities would be expected to be higher for ULSD than RME, leading to increased heat losses and lower NO x emissions when fuelling with ULSD. …”

Section: Results and Discussionmentioning

confidence: 99%

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Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel

et al. 2013

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It is commonly reported in the literature that NO x emissions from a diesel engine increase when fuelling with biodiesel. However, some studies report varying or opposite results. This work scrutinized operating conditions known to yield both increases and decreases in NO x emissions when running on biodiesel. This involved sweeping the injection timing of an instrumented 2 L diesel engine from 14 BTDC (before top-dead-center) to 3 ATDC (after top-dead-center), under loads of 40 Nm and 80 Nm (equating to BMEP (brake mean effective pressure) of 2.5 bar and 5 bar, respectively), using ultralow sulfur diesel (ULSD) and rapeseed methyl ester (RME). Under a 40 Nm load, RME consistently generated lower NO x emissions than ULSD, whereas, under an 80 Nm load, RME generated higher NO x emissions at all but the most advanced/retarded injection timings. This behavior was linked to differences in combustion duration, ignition delay (ID), and the relative size of the premixed burn fraction (PMBF). Combustion tended to progress more quickly overall for the fuel that generated highest NO x emissions at most operating conditions. ID was always reduced when fuelling with RME, and hence PMBF was also reduced. Thus, reduced ID exerted conflicting influences over relative RME NO x emissions; a tendency to increase NO x , due to advanced start of combustion (SOC), and a tendency to decrease NO x , due to reduced PMBF. Additionally, calculations indicated that for the same SOC and PMBF RME would normally be expected to generate higher NO x emissions than ULSD. However, as the level of premixing increased, the magnitude of the ceteris paribus RME NO x increase appeared to decline. That is, as PMBF increases, the impact of the inherent factors beyond advanced SOCthat lead to higher NO x emissions when fuelling with biodiesel appear to be reduced. This may be related to variations in soot radiative heat losses. Changes in operating PMBF may therefore explain some of the variety that exists in the literature relating to the effects of biodiesel fuelling on NO x emissions.

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Section: Results and Discussionmentioning

confidence: 99%

“…It has been reported that as the relative proportion of diffusion burning increases soot emissions also increase. 57,90,91 This being understood, and assuming at least some degree of correlation between soot emissions and in-cylinder soot, it is possible to conceive of the following hypothesis:…”

Section: Resultsmentioning

confidence: 99%

Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel

et al. 2013

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Extended or Extreme Service - A New Technology Concept for the Ultimate Oil Drain Interval System

Polati¹,

Costa

2002

SAE Technical Paper Series

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Experimental Investigation of Smoke Emission Dependent upon Engine Operating Conditions

Cited by 2 publications

References 14 publications

Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel

Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel

Extended or Extreme Service - A New Technology Concept for the Ultimate Oil Drain Interval System

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Experimental Investigation of Smoke Emission Dependent upon Engine Operating Conditions

Cited by 2 publications

References 14 publications

Premixed Burn Fraction: Its Relation to the Variation in NOx Emissions between Petro- and Biodiesel

Premixed Burn Fraction: Its Relation to the Variation in NOx Emissions between Petro- and Biodiesel

Extended or Extreme Service - A New Technology Concept for the Ultimate Oil Drain Interval System

Contact Info

Product

Resources

About

Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel

Premixed Burn Fraction: Its Relation to the Variation in NO_x Emissions between Petro- and Biodiesel