Effects of intake oxygen mole fraction on the near-stoichiometric combustion and emission characteristics of a CI (compression ignition) engine

Cha, Junepyo; Yoon, Sanghoo; Lee, Seokhwon; Park, Sungwook

doi:10.1016/j.energy.2014.12.023

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…However, in this work, the ISNO value was dramatically decreased at a certain start of energizing timing ( t eng = BTDC 23 deg). This phenomenon showed the same tendency as the results of previous studies 16,17 . The fuel under t eng = BTDC 23 deg condition targeted the top part of the piston bowl and injected.…”

Section: Resultssupporting

confidence: 88%

“…The experiment was conducted to verify the numerical analysis and Figure 1 shows the schematic of the experimental setup, which was referred to the previous study, 16 in this study. The experiment conditions and results were referred to the previous study 17 .…”

Section: Experimental and Numerical Descriptionsmentioning

confidence: 99%

“…[12][13][14] As well known, NO X and soot emissions are a trade-off relationship. So, Pandey et al 15 have progressed a study under the early injection timing and various EGR rate conditions, and Cha et al 16 and have progressed an experimental study to simultaneously reduce the NO X and soot emission by using simulated-EGR, which composed of N 2 gas under PCCI conditions. Min et al 17 have also conducted a numerical study to investigate the effect of simulated-EGR (N 2 ) on the fuel mass fraction distributions and the formation/oxidation of exhaust emissions in CI engine.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions

Min

Suh

2020

Env Prog and Sustain Energy

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The objective of this study is to investigate the effect of CO2 mole fraction by simulated‐exhaust gas recirculation (EGR) on the simultaneous reduction of exhaust emission in CI engine, and to find the optimal operating conditions.For the better expression of the actual EGR, the different CO2 mole fractions from 0% to 20% were applied for the simulated‐EGR. The CO2 mole fraction by simulated‐EGR was changed in the initial air in steps of 5% from 0% to 20% in the cylinder. The N2 mole fraction in the initial air was also changed according to the CO2 mole fraction, and the O2 mole fraction was fixed by 16.2% due to the same overall equivalence ratio.When the CO2 mole fraction by simulated‐EGR increased by 5%, the peak cylinder pressure was decreased by about −1.5% and the indicated specific nitrogen oxide value was also reduced from −4.9% to −48.8% because the ignition delay was longer by the higher specific heat of CO2 than N2, it induced to suppress the rise of cylinder temperature. In addition, when the start of energizing timing was advanced until BTDC 23 deg, the ISSoot value was decreased because the proportion of premixed combustion was increased.

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Section: Resultssupporting

confidence: 88%

Section: Experimental and Numerical Descriptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions

Min

Suh

2020

Env Prog and Sustain Energy

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“…Pandey et al [2] have announced that the PCCI method can secure greater time for air and fuel mixing than the general CI method however, it still does not meet various exhaust emission regulations. So, Cha et al [3] and Min et al [4] have progressed the studies to simultaneously reduce exhaust emissions by using simulated-EGR under the PCCI method. They found that when the specific start of energizing timing can reduce the exhaust emissions simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

Min¹,

Suh²

2023

Preprint

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The objective of this study is to investigate the effect of the premixed ethanol ratio based on the same total heating value in-cylinder on the equivalence ratio distributions and the injected fuel droplet behavior in the cylinder of the RCCI engine. The spray simulation was conducted by dividing two-part. First, the spray validation simulations progressed to find the spray-influenced factor of the test injector. Next, the engine simulations were performed with the spray-influenced factor obtained from spray validation simulations to investigate the effect of the premixed ethanol ratio based on the same total heating value in-cylinder on the injected fuel atomization and the equivalence ratio distributions. The introduced total heating value was fixed at 595J based on the lower heating value of diesel 14mg. The heating value of the premixed ethanol ratio varied from 0% to 40% based on the same total heating value in-cylinder in steps of 10%. It was revealed that when the premixed ethanol ratio based on the same total heating value in-cylinder was increased, the spray tip penetration value was reduced from the time after 4deg of diesel injection start because of the short injection duration by the small amount of diesel fuel. The SMD value was also more enormous up to 32.58% with increasing the premixed ethanol ratio because of the low kinetic energy of the injected fuel by the short injection duration and the slow evaporation of the injected fuel by the low cylinder temperature.

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“…Pandey et al [2] suggested that the PCCI method can secure more time for air and Fire 2023, 6, 249 2 of 14 fuel mixing than the general CI method; however, it still does not meet various exhaust emission regulations. Thus, Cha et al [3] and Min et al [4] progressed their studies further to simultaneously reduce exhaust emissions by using simulated EGR under the PCCI method. They found that specific start times of energizing can reduce exhaust emissions simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

Min,

Suh

2023

Fire

View full text Add to dashboard Cite

The objective of this study was to investigate the effect of a premixed ethanol ratio based on the same total heating value in a cylinder on the equivalence ratio distributions and the injected fuel droplet behavior in the cylinder of an RCCI engine. The spray simulation was conducted in two parts. First, we carried out spray validation simulations to determine the spray-influenced factor of the test injector. Next, engine simulations were performed with the spray-influenced factor obtained from the spray validation simulations to investigate the effect of the premixed ethanol ratio based on the same total heating value in a cylinder on the injected fuel atomization and the equivalence ratio distributions. The introduced total heating value was fixed at 595 J based on the lower heating value of diesel, 14 mg. The heating value of the premixed ethanol ratio varied from 0% to 40% based on the same total heating value in the cylinder in steps of 10%. It was revealed that when the premixed ethanol ratio based on the same total heating value in the cylinder was increased, the spray tip penetration value was reduced after 4 deg of diesel was injected because of the short injection duration and the small amount of diesel fuel used. The SMD value was also increased up to 32.58% with an increasing premixed ethanol ratio because of the low kinetic energy of the injected fuel, the short injection duration, the slow evaporation of the injected fuel and the low cylinder temperature.

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Effects of intake oxygen mole fraction on the near-stoichiometric combustion and emission characteristics of a CI (compression ignition) engine

Cited by 15 publications

References 27 publications

Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions

Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

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Effects of intake oxygen mole fraction on the near-stoichiometric combustion and emission characteristics of a CI (compression ignition) engine

Cited by 15 publications

References 27 publications

Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO2 + N2) in compression ignition engine under early combustion conditions

Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO2 + N2) in compression ignition engine under early combustion conditions

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

Effect of Premixed Ethanol Ratio Based on the Same Heating Value on the Atomization of Diesel Fuel Injected in the Cylinder

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Product

Resources

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Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions

Optimization of simultaneous reduction of NO and soot by using simulated‐exhaust gas recirculation (CO₂ + N₂) in compression ignition engine under early combustion conditions