Studies on the Impact of 300 MPa Injection Pressure on Engine Performance, Gaseous and Particulate Emissions

Natti, Krishna C.; Sinha, Alka; Hoerter, Christian; Andersson, Per; Andersson, Jon; Lohmann, Craig; Schultz, Drew; Cho, Nam Hyo; Winsor, Richard

doi:10.4271/2013-01-0897

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…Alternatively, the increase in the injection pressures significantly reduced fuel consumption at constant NO x and smoke emissions. From 250 to 300 MPa, the effect of injection pressure on smoke and fuel consumption is limited at higher NO x levels [31]. With a fuel injection pressure of 320 MPa, the duration of combustion is shorter, while the ignition delay changes very little if the injection fuel mass and the fuel injection pressure are the same [32].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Impact of Piston Bowl Size on Diesel Engine Characteristics with Changes in Fuel Injection Pressure and Boost Pressure

Nguyen,

Dunin

2024

Applied Sciences

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This study presents the effects of piston bowl size on the characteristics of a four-stroke single-cylinder diesel engine, which is considered in relation to changes in factors such as fuel injection pressure and turbocharger pressure. The study was carried out by 3D modeling using AVL Fire with an omega combustion chamber size and dimensions determined by the ratio between the diameter and depth of the piston bowl, which varies from 3.4 to 10.0. Additionally, the turbocharger pressure varies from 0.15 to 0.45 MPa at an engine speed of 1400 rpm and fuel injection pressure up to 300 MPa. The results show that the engine reaches the best values of indicated power, fuel efficiency, and a substantial decrease in emissions of nitrogen oxides at a turbocharger pressure from 0.25 to 0.35 MPa and with a ratio of the diameter to the depth from 7.8 to 10. However, the injection angle changes slightly, and the penetration depth and the tip velocity decrease with increasing boost pressure. While the piston bowl parameters only impact significantly on the tip velocity, the penetration and the spray angle are almost unchanged. In addition, the variation in the diameter of the combustion chamber has an influence on the fluctuation of the spray tip velocity and penetration.

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Section: Introductionmentioning

confidence: 99%

Investigation into the Impact of Piston Bowl Size on Diesel Engine Characteristics with Changes in Fuel Injection Pressure and Boost Pressure

Nguyen,

Dunin

2024

Applied Sciences

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“…In the research presented in this paper, a ramped combustion chamber (referred to as bowl B6) was used. The bowl was developed for conventional injection timings as a means of delivering low particulate emission at high EGR rates at high load [9,10]. The bowl differs from other ramped chambers such as [11], in that the chamber shape is designed to promote improved mixing by splitting the impinging fuel spray and directing the jet back into the combustion bowl ( figure 1b).…”

Section: Late Injection Low Temperature Combustionmentioning

confidence: 99%

A Late Injection Combustion Strategy Using a Novel Ramped Combustion System

Morgan

Heikal

Pike-Wilson

2017

SAE Technical Paper Series

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Traffic related NOx and particle emission remain a significant concern particularly in the urban environment. Electrification offers a medium to long term solution, but there remains a need to significantly reduce internal combustion engine emissions in the short and medium term, and potentially in the long term for long range inter city transportation. Late injection low temperature combustion (LTC) has the potential to achieve ultra-low emissions levels in a compression ignition engine by increasing the lean pre-mixed burn fraction. However, significant quantities of diluent are normally required to achieve the required delay in ignition and pre-mixing to achieve LTC. This results in high boost requirements, increased pumping work and the complexity of the air handling system and potentially adversely impacting fuel economy. In this paper, results from a single cylinder light duty research engine are presented using a novel ramped combustion chamber focused at mid to high engine loads. The ramped combustion chamber improves mixing and enables more retarded injection timings than those possible on conventional bowl designs. This combustion strategy has enabled LTC conditions to be achieved at lower dilution rates, typically 20-30% at loads up to 15bar IMEP. CFD analysis of the air-fuel interaction indicates the ramped bowl effectively deflects fuel away from the squish region enabling very late injection timings. One dimensional analysis of the engine system was used to investigate the potential of late exhaust valve opening in improving work recovery, resulting in improved fuel consumption over the baseline LTC valve timings.

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Investigation of a ‘SCR-free’ system to meet the Stage IV and beyond emissions limits

et al. 2017

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Studies on the Impact of 300 MPa Injection Pressure on Engine Performance, Gaseous and Particulate Emissions

Cited by 9 publications

References 12 publications

Investigation into the Impact of Piston Bowl Size on Diesel Engine Characteristics with Changes in Fuel Injection Pressure and Boost Pressure

Investigation into the Impact of Piston Bowl Size on Diesel Engine Characteristics with Changes in Fuel Injection Pressure and Boost Pressure

A Late Injection Combustion Strategy Using a Novel Ramped Combustion System

Investigation of a ‘SCR-free’ system to meet the Stage IV and beyond emissions limits

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