The Analysis of Combustion Flame Under EGR Conditions in a DI Diesel Engine

Shiozaki, Tadakazu; Nakajima, Hiroshi; Kudo, Yugo; Miyashita, Akira; Aoyagi, Yoshinobu

doi:10.4271/960323

Cited by 31 publications

(10 citation statements)

References 13 publications

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“…Many methods applied by engine manufacturers have successfully reduced the emission level. In Japan, to meet the NO x emission regulations, the trend is towards retarding the fuel injection timing [17,31]. NO x emissions are reduced with injection timing retardation from MBT injection timings.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fuel injection timing with waste cooking oil as a fuel in a direct injection diesel engine

Bari

Lim

2004

Proceedings of the Institution of Mechanical Engineers, Part D:

145

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For a diesel engine, injection timing is a major parameter that sensitively a ects the engine performance, emission and durability. The physical and chemical properties of vegetable oils are known to be different from those of diesel. This study examines the changes in the behaviour of waste cooking oil (WCO) with changes in injection timing of a direct injection (DI) diesel engine, compared with those of diesel. The aspects taken into consideration were the effects of injection timing on combustion, performance and emissions. The results reveal that WCO and diesel responded identically to injection timing changes. To reduce NOx emission, one of the methods is to retard the injection timing from MBT timing. The engine used in this research follows this technique and had its original injection timing set at 15° before top dead centre (BTDC). With injection timing advanced by 4°, the engine produced better e ciency by 1.6 per cent for WCO and by 1.1 per cent for diesel, reduced CO emission, by averages of 9.9 per cent for WCO and 44.9 per cent for diesel, but su ered increased NO emission of 76.6 per cent for WCO and 91.4 per cent for diesel. In all instances, WCO had shorter ignition delays than diesel, but the ignition delay for WCO was more sensitive to load and injection timing than that for diesel. The test engine could run on WCO with the original injection timing, and altering the timing could result in a trade-o between performance and emission.

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Section: Introductionmentioning

confidence: 99%

Effect of Fuel injection timing with waste cooking oil as a fuel in a direct injection diesel engine

Bari

Lim

2004

Proceedings of the Institution of Mechanical Engineers, Part D:

145

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“…There is an increase in the raw AE signal just after the start of the fuel injection at 2 after TDC indicated by the sharp increase in the needle lift, which can be explained by air-fuel mixture combustion just after the fuel has been injected although the cylinder pressure did not rise until 7 after the TDC. The reason for the delay in the cylinder pressure increase has been explained by Shiozaki et al [10] who found that the rate of heat release due to combustion in the cylinder starts somewhat before the cylinder pressure begins to rise.…”

Section: Signal Behaviourmentioning

confidence: 96%

“…Shiozaki et al [10] have found that the heat release due to combustion in the cylinder starts somewhat before the start of increase of the cylinder pressure where the rate of heat released (ROHR starting at the beginning of ignition) is 5 after TDC while the pressure started to rise at 8 after TDC. This is evidence that the first phase of the rms AE signal is associated with the start of combustion.…”

Section: Article In Pressmentioning

confidence: 98%

Indirect measurement of cylinder pressure from diesel engines using acoustic emission

El-Ghamry

Steel

Reuben

et al. 2005

Mechanical Systems and Signal Processing

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“…extended mixing-controlled combustion). 20–22 Given these characteristics, the enhanced premixed combustion corresponding to advanced injection timing leads to higher peak combustion pressure and temperature, thereby improving engine efficiency and performance. 12,17,21,22…”

Section: Introductionmentioning

confidence: 99%

Understanding the soot reduction associated with injection timing variation in a small-bore diesel engine

Rao

Zhang

Kook

et al. 2019

International Journal of Engine Research

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This study shows the in-cylinder soot reduction mechanism associated with injection timing variation in a small-bore optical diesel engine. For the three selected injection timings, three optical-/laser-based imaging diagnostics were performed to show the development of high-temperature reaction and soot within the cylinder, which include OH* chemiluminescence, planar laser–induced fluorescence of hydroxyl and planar laser–induced incandescence. In addition, detailed soot morphology analysis was conducted using thermophoresis-based soot particle sampling from two locations within the piston bowl, and the subsequent analysis of transmission electron microscope (TEM) images of the sampled soot aggregates was also conducted. The results suggest that when fuel injection timing is varied, ambient gas temperature makes a predominant effect on soot formation and oxidation. This is primarily combustion phasing effect as the advanced fuel injection moved the start of combustion closer to the top dead centre, and therefore, soot formation and oxidation occurred at elevated ambient gas temperature. There was an overall development pattern of in-cylinder soot consistently found for three injection timings of this study. The planar laser–induced incandescence images showed that a few small soot pockets first appear around the jet axis, which promptly grow into large soot regions behind the head of the flame marked planar laser–induced fluorescence of hydroxyl. The soot signals disappear due to significant oxidation induced by surrounding OH radicals. When the injection timing is advanced, the soot formation becomes higher as indicated by higher total laser–induced incandescence coverage, increased sampled particle counts and larger and more stretched soot aggregate structures. However, soot oxidation is also enhanced under this elevated ambient temperature environment. At the most advanced injection timing of this study, the enhanced soot oxidation outperformed the increased soot formation with both peak laser–induced incandescence signal coverage and late-cycle coverage showing lower values than those of more retarded injection timings.

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The Analysis of Combustion Flame Under EGR Conditions in a DI Diesel Engine

Cited by 31 publications

References 13 publications

Effect of Fuel injection timing with waste cooking oil as a fuel in a direct injection diesel engine

Effect of Fuel injection timing with waste cooking oil as a fuel in a direct injection diesel engine

Indirect measurement of cylinder pressure from diesel engines using acoustic emission

Understanding the soot reduction associated with injection timing variation in a small-bore diesel engine

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