SAE Technical Paper Series 2019

DOI: 10.4271/2019-01-2273

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Investigation of a novel leaner fuel spray formation for reducing soot in diffusive diesel combustion- Homogenizing equivalence ratio distribution in the lift-off region -

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Cited by 12 publications

(8 citation statements)

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“…This longer mixing length prior to ignition improves the diesel spray's potential to achieve LLFC. Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and computationally. 7,19,[22][23][24][25][26][27] A number of studies have investigated the impact of duct geometry on DFI combustion in pressure vessels [7][8][9][10][11][12][13]18,26 and engines.…”

Section: Introductionmentioning

confidence: 99%

“…Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and computationally. 7,19,[22][23][24][25][26][27] A number of studies have investigated the impact of duct geometry on DFI combustion in pressure vessels [7][8][9][10][11][12][13]18,26 and engines. [14][15][16][17]19,20,28 Figure 1 shows important geometric parameters in DFI, including the duct inlet and exit shape, the duct inner diameter (D), the duct length (L), and the gap distance between the injector orifice and the duct inlet (G).…”

Section: Introductionmentioning

confidence: 99%

“…Other authors have deployed DFI in engines with varying levels of success. For example, Tanno et al 19 found that DFI reduced engine-out soot by up to 52%, while Svensson et al 28 found that DFI consistently produced more soot than CDC at full-load conditions. Indeed, the results of Svensson et al contrast with others in the literature in several ways.…”

Section: Introductionmentioning

confidence: 99%

“…This longer mixing length prior to ignition improves the diesel spray’s potential to achieve LLFC. Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,6–21 and computationally. 7,19,22–27…”

Section: Introductionmentioning

confidence: 99%

“…Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,6–21 and computationally. 7,19,22–27…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Parametric evaluation of ducted fuel injection in an optically accessible mixing-controlled compression-ignition engine with two- and four-duct assemblies

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³

et al. 2023

International Journal of Engine Research

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Ducted fuel injection (DFI) is a strategy to improve fuel/charge-gas mixing in direct-injection compression-ignition engines. DFI involves injecting fuel along the axis of a small tube in the combustion chamber, which promotes the formation of locally leaner mixtures in the autoignition zone relative to conventional diesel combustion. Previous work has demonstrated that DFI is effective at curtailing engine-out soot emissions across a wide range of operating conditions. This study extends previous investigations, presenting engine-out emissions and efficiency trends between ducted two-orifice and ducted four-orifice injector tip configurations. For each configuration, parameters investigated include injection pressure, injection duration, intake manifold pressure, intake manifold temperature, start of combustion timing, and intake-oxygen mole fraction. For both configurations and across all parameters, DFI reduced engine-out soot emissions compared to conventional diesel combustion, with little effect on other emissions and engine efficiency. Emissions trends for both configurations were qualitatively the same across the parameters investigated. The four-duct configuration had higher thermal efficiency and indicated-specific engine-out nitrogen oxide emissions but lower indicated-specific engine-out hydrocarbon and carbon monoxide emissions than the two-duct assembly. Both configurations achieved indicated-specific engine-out emissions for both soot and nitrogen oxides that comply with current on- and off-road heavy-duty regulations in the United States without exhaust-gas aftertreatment at an intake-oxygen mole fraction of 12%. High-speed in-cylinder imaging of natural soot luminosity shows that some conditions include a second soot-production phase late in the cycle. The probability of these late-cycle events is sensitive to both the number of ducted sprays and the operating conditions.

“…This longer mixing length prior to ignition improves the diesel spray's potential to achieve LLFC. Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and computationally. 7,19,[22][23][24][25][26][27] A number of studies have investigated the impact of duct geometry on DFI combustion in pressure vessels [7][8][9][10][11][12][13]18,26 and engines.…”

Section: Introductionmentioning

confidence: 99%

“…Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and computationally. 7,19,[22][23][24][25][26][27] A number of studies have investigated the impact of duct geometry on DFI combustion in pressure vessels [7][8][9][10][11][12][13]18,26 and engines. [14][15][16][17]19,20,28 Figure 1 shows important geometric parameters in DFI, including the duct inlet and exit shape, the duct inner diameter (D), the duct length (L), and the gap distance between the injector orifice and the duct inlet (G).…”

Section: Introductionmentioning

confidence: 99%

“…Other authors have deployed DFI in engines with varying levels of success. For example, Tanno et al 19 found that DFI reduced engine-out soot by up to 52%, while Svensson et al 28 found that DFI consistently produced more soot than CDC at full-load conditions. Indeed, the results of Svensson et al contrast with others in the literature in several ways.…”

Section: Introductionmentioning

confidence: 99%

“…This longer mixing length prior to ignition improves the diesel spray’s potential to achieve LLFC. Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,6–21 and computationally. 7,19,22–27…”

Section: Introductionmentioning

confidence: 99%

“…Based on early successes, multiple research groups have begun to investigate DFI both experimentally 1,6–21 and computationally. 7,19,22–27…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Parametric evaluation of ducted fuel injection in an optically accessible mixing-controlled compression-ignition engine with two- and four-duct assemblies

¹

,

²

,

³

et al. 2023

International Journal of Engine Research

View full text Add to dashboard Cite

Ducted fuel injection (DFI) is a strategy to improve fuel/charge-gas mixing in direct-injection compression-ignition engines. DFI involves injecting fuel along the axis of a small tube in the combustion chamber, which promotes the formation of locally leaner mixtures in the autoignition zone relative to conventional diesel combustion. Previous work has demonstrated that DFI is effective at curtailing engine-out soot emissions across a wide range of operating conditions. This study extends previous investigations, presenting engine-out emissions and efficiency trends between ducted two-orifice and ducted four-orifice injector tip configurations. For each configuration, parameters investigated include injection pressure, injection duration, intake manifold pressure, intake manifold temperature, start of combustion timing, and intake-oxygen mole fraction. For both configurations and across all parameters, DFI reduced engine-out soot emissions compared to conventional diesel combustion, with little effect on other emissions and engine efficiency. Emissions trends for both configurations were qualitatively the same across the parameters investigated. The four-duct configuration had higher thermal efficiency and indicated-specific engine-out nitrogen oxide emissions but lower indicated-specific engine-out hydrocarbon and carbon monoxide emissions than the two-duct assembly. Both configurations achieved indicated-specific engine-out emissions for both soot and nitrogen oxides that comply with current on- and off-road heavy-duty regulations in the United States without exhaust-gas aftertreatment at an intake-oxygen mole fraction of 12%. High-speed in-cylinder imaging of natural soot luminosity shows that some conditions include a second soot-production phase late in the cycle. The probability of these late-cycle events is sensitive to both the number of ducted sprays and the operating conditions.

Schlieren investigation on impacts of duct size on macroscopic spray characteristics of ducted fuel injection

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et al. 2020

Applied Thermal Engineering

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No abstract

Visualization and simulation study on impacts of wall roughness on spray characteristics of ducted fuel injection

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et al. 2022

Applied Thermal Engineering

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No abstract

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