Control of Diesel Engine Pollutants by Split Injection Method using Muitizone Model

Babu, A. K.; Devaradjane, G.

doi:10.4271/2001-28-0007

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Changes in post-injection duration also affect the performance of post injections. Many of the studies that investigated the effects of post-injection duration included data that fall into the "split injection" category [10,18,31,38,75,76], Wherever possible, only the cases where the split-injection schedule would qualify as post injections (20% or less of the total fuel in the post-injection) are discussed here.…”

Section: Figure 11 Temperature Field Comparison Between Maininjectiomentioning

confidence: 99%

Post Injections for Soot Reduction in Diesel Engines: A Review of Current Understanding

O’Connor

Musculus

2013

SAE Int. J. Engines

142

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This work is a technical review of past research and a synthesis of current understanding of post injections for soot reduction in diesel engines. A post injection, which is a short injection after a longer main injection, is an in-cylinder tool to reduce engine-out soot to meet pollutant emissions standards while maintaining efficiency, and potentially to reduce or eliminate exhaust aftertreatment. A sprawling literature on post injections documents the effects of post injections on engine-out soot with variations in many engine operational parameters. Explanations of how post injections lead to engineout soot reduction vary and are sometimes inconsistent or contradictory, in part because supporting fundamental experimental or modeling data are often not available. In this paper, we review the available data describing the efficacy of post-injections and highlight several candidate in-cylinder mechanisms that may control their efficacy. We first discuss three in-cylinder mechanisms that have been frequently proposed to explain how post injections reduce engine-out soot. Thereafter, to provide a foundation for interpretation of past research, we briefly review basic soot formation and oxidation chemistry, and soot/fluid processes in fuel sprays and engine flows. Next, we provide a comprehensive overview of the literature on the efficacy of post-injections for soot reduction as a function of engine operational parameters including injection duration and dwell, exhaust-gas recirculation, load, boost, speed, swirl, and spray targeting. We conclude by identifying major remaining research questions that need to be addressed to help achieve a design-level understanding of the mechanisms of soot reduction by post injections.

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Section: Figure 11 Temperature Field Comparison Between Maininjectiomentioning

confidence: 99%

Post Injections for Soot Reduction in Diesel Engines: A Review of Current Understanding

O’Connor

Musculus

2013

SAE Int. J. Engines

142

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“…It have been found in earlier studies that a split injection increases the soot oxidation process in the late stages of the combustion process. This allows the injection to be retarded to reduce NO x emissions while keeping soot levels konstant [2,3,4,5]. More fundamental investigations on split injections like spray studies where the effect of split injections on spray formation and fuel/air mixture is investigated, are also found in the literature, e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Split Injections at Low Load in an HDDI Diesel Engine Equipped with a Piezo Injector

Ehleskog¹,

Golovitchev²,

Denbratt³

et al. 2006

SAE Technical Paper Series

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In order to investigate the effects of split injection on emission formation and engine performance, experiments was carried out using a heavy duty single cylinder Diesel engine. Split injections with varied dwell time and start of injection were investigated and compared with single injection cases. In order to isolate the effect of the parameters selected to investigate, other variables were kept constant. In this investigation no EGR was used. The engine was equipped with a common rail injection system with a piezoelectric injector. To interpret the observed phenomena, engine CFD simulations using the KIVA-3V code were also made.The results show that a reduction in NO x emissions and brake specific fuel consumption was achieved for short dwell times whereas they were increased when the dwell time was prolonged. No EGR was used so the soot levels were already very low in the cases of single injections. The results indicated, however, no increase in soot as a result of splitting the injection in two parts. Both HC and CO emissions were found to increase with split injections.

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“…Mass of fuel injected per cycle is given by [5] Where ρf (density of liquid fuel), Anoz (nozzle orifice area) and uinj (injection velocity) given by [7]…”

Section: Sub-model For Egr Calculationsmentioning

confidence: 99%

"Effect of Fuel Injection Pulse and Dwell Period in Split Injections on the Performance and Emissions of a Diesel Engine"

Amba Prasad Rao,

Ravichettu

2024

IJAER

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The diesel-fuelled engines are fuel efficient but are prone to high levels of NOx and soot emission. It has become easier to have precise control over fuel injection parameters with electronics-embedded diesel engine components mostly available on the common rail injection system of multi-cylinder engines. In the present competitive market, to utilize and continue the usage of diesel-fuelled engines efficiently, an attempt has been made with an in-house developed computational code to employ a split or multiple injection strategies for a direct injection single-cylinder diesel engine to obtain lower harmful emissions with appreciable engine performance. A quasi-dimensional model involving the engine parameters; equivalence ratio, injection timing, exhaust gas recirculation, pilot injection timing and its quantity. In addition, injection pulses with two different dwell periods are considered. The capabilities of the quasi-dimensional model have been verified and the trends are observed to be in line with the literature. The results of numerical experiments considering split injections with a variation of fuel quantities in the first pulse [10% -75%] with two dwell periods [8•CA and 3•CA] in conjunction with moderate boost pressures [10% to 30%] resulted in effective NOx-soot-piston work trade-off. Injection strategies with lower pilot quantity and larger dwell have resulted in lower NOx emissions and larger pilot quantity with retarded main injection timing has effectively addressed perennial NOx-soot trade-offs and would effectively address stringent emission norms.

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Control of Diesel Engine Pollutants by Split Injection Method using Muitizone Model

Cited by 6 publications

References 2 publications

Post Injections for Soot Reduction in Diesel Engines: A Review of Current Understanding

Post Injections for Soot Reduction in Diesel Engines: A Review of Current Understanding

Experimental and Numerical Investigation of Split Injections at Low Load in an HDDI Diesel Engine Equipped with a Piezo Injector

"Effect of Fuel Injection Pulse and Dwell Period in Split Injections on the Performance and Emissions of a Diesel Engine"

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