The Role of Oxygen in Intake and Exhaust on NO Emission, Smoke and BMEP of a Diesel Engine with EGR System

Tsunemoto, Hideyuki; Ishitani, Hiromi

doi:10.4271/800030

Cited by 33 publications

(9 citation statements)

References 5 publications

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“…A small reduction in air-flow rate would not be too severe at part loads but at full load, where air utilization is a critical factor in a DI diesel engine, it is certainly undesirable. This may be the reason why smoke density decreased substantially at part loads than at full rated load [10].…”

Section: Io/smentioning

confidence: 99%

“…Experimental evidence indicates that oxygen, in sufficient quantity, suppresses soot formation. Such reduction of smoke emission may occur either by interfering with the polymerization process or by directly burning soot particles in the presence of sufficiently high temperature [10,11]. It is also considered that OH radicals may help to remove soot on one hand but they also play an important role in the dehydrogenation process which leads to soot formation.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen aspiration in a direct injection type diesel engine-its effects on smoke and other engine performance parameters

Varde

Frame

1983

International Journal of Hydrogen Energy

107

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An experimental study was undertaken to investigate the possibility of reducing diesel particulates in the exhaust by aspirating small quantities of gaseous hydrogen in the intake of a diesel engine. A single cylinder, direct injection type diesel engine was used in the experiments. Hydrogen flow rates equivalent to about 10% of the total energy substantially reduced smoke emissions at part loads. At the full rated load, reduction in smoke levels was limited; this is believed to be due to the lower amounts of excess air available in the cylinder. It was found that the engine thermal efficiency was dependent on the portion of hydrogen energy, out of the total input energy, supplied to the engine. There was no significant change in the hydrocarbon emissions but oxides of nitrogen in the exhaust increased with an increase in hydrogen energy. A/F EitOpeak NOMENCLATURE air-fuel ratio (kg/kg) rate of hydrogen energy supply (KJ/s) rate to total energy supply (KJ/s) angle when peak pressure occurs (deg) fuel air equivalence ratio (q~ < 1 is lean)

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Section: Io/smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen aspiration in a direct injection type diesel engine-its effects on smoke and other engine performance parameters

Varde

Frame

1983

International Journal of Hydrogen Energy

107

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Section: Introductionmentioning

confidence: 99%

“…Decades of research at the vehicle scale point out both RH and elevation enhanced particulate emissions from internal combustion engines [26][27][28][29]. Increased RH results in lower temperature due to the increased heat capacity of the cylinder air charge [26]. Furthermore, an increase in soot particles, hydrocarbons, and other unburnt fuel compounds that form primary particles is also due to higher atmospheric moisture content reducing the air density at intake and causing a decrease in oxygen content, influencing the air-to-fuel ratio of the combust mixture [9,28].…”

Section: Introductionmentioning

confidence: 99%

Contrasted Effects of Relative Humidity and Precipitation on Urban PM2.5 Pollution in High Elevation Urban Areas

2018

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Levels of urban pollution can be influenced largely by meteorological conditions and the topography of the area. The impact of the relative humidity (RH) on the daily average PM 2.5 concentrations was studied at several sites in a mid-size South American city at a high elevation over the period of nine years. In this work, we show that there is a positive correlation between daily average urban PM 2.5 concentrations and the RH in traffic-busy central areas, and a negative correlation in the outskirts of the city in more industrial areas. While in the traffic sites strong events of precipitation (≥9 mm) played a major role in PM 2.5 pollution removal, in the city outskirts, the PM 2.5 concentrations decreased with increasing RH independently of rain accumulation. Increasing PM 2.5 concentrations are to be expected in any highly motorized city where there is high RH and a lack of strong precipitation, especially in rapidly growing and developing countries with high motorization due to poor fuel quality. Finally, two models, based on a logistic regression algorithm, are proposed to describe the effect of rain and RH on PM 2.5 , when the source of pollution is traffic-based vs. industry-based.

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“…(Kohketsu et al, 1997) The mechanism of NO reduction with EGR has been explored extensively. ( Tsunemoto and Ishitani, 1980;Zelenka et al, 1998) Tsunemoto andIshitani (1980) suggested that the effect of EGR on NO reduction might be due to two factors: lowering the combustion temperature with an increased heat capacity and a reduction of oxygen concentration in the cylinder charge. Zelenka et al (l998) showed that the cooled EGR is indispensable to meet the NOx emission regulations in the future.…”

Section: Spray Modelmentioning

confidence: 99%

Multidimensional engine modeling: NO and soot emissions in a diesel engine with Exhaust Gas Recirculation

Kim

Sung

2001

KSME International Journal

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The effects of EGR(Exhaust Gas Recirculation) on heavy-duty diesel engine performance, NO and soot emissions were numerically investigated using the modified KIV A-3V code. For the fuel spray, the atomization model based on the linear stability analysis and spray wall impingement model were developed for the KIVA-3V code. The Zeldovich mechanism for the formation of nitric oxide and the soot model suggested by Hiroyasu et al. were used to predict the diesel emissions. In this paper, the computational results of fuel spray, cylinder pressure, and emissions were compared with experimental data, and the optimum EGR rates were sought from the NO and soot emissions trade-off. The results showed that the EGR is effective in suppressing NO but the soot emission was increased considerably by EGR. Using cooled EGR, soot emission could be enhanced without worsening of NO.

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The Role of Oxygen in Intake and Exhaust on NO Emission, Smoke and BMEP of a Diesel Engine with EGR System

Cited by 33 publications

References 5 publications

Hydrogen aspiration in a direct injection type diesel engine-its effects on smoke and other engine performance parameters

Hydrogen aspiration in a direct injection type diesel engine-its effects on smoke and other engine performance parameters

Contrasted Effects of Relative Humidity and Precipitation on Urban PM2.5 Pollution in High Elevation Urban Areas

Multidimensional engine modeling: NO and soot emissions in a diesel engine with Exhaust Gas Recirculation

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