Advances in Diesel Engine Combustion: Split Combustion

Weiskirch, Christian; Müller, Eckart

doi:10.4271/2007-01-0178

Cited by 12 publications

(10 citation statements)

References 7 publications

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“…Besides, the high cetane number of conventional diesel fuel results in large rates of pressure rise and difficulties in combustion phasing control [15][16][17][18][19]. PCCI combustion has been described as a middle path between conventional and HCCI combustion modes [20][21][22][23]. In HCCI combustion, there is the challenge of combustion phasing control and homogeneous mixture preparation.…”

Section: Conception Of Hcci and Pcci Combustionmentioning

confidence: 99%

A Review of Early Injection Strategy in Premixed Combustion Engines

Liang

Zhang

et al. 2019

Applied Sciences

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Due to the increasing awareness of environmental protection, limitations on exhaust emissions of diesel engines have become increasingly stringent. This challenges diesel engine manufacturers to find a new balance between engine performance and emissions. Advanced combustion modes for diesel engines, such as homogeneous charge compression ignition (HCCI) and premixed charge compression ignition (PCCI), which can simultaneously reduce exhaust emissions and substantially improve thermal efficiency, have drawn increasing attention. In order to allow enough time to prepare the homogeneous mixture, the early injection strategy has been utilized widely in HCCI and PCCI diesel engines. This paper is aimed at providing a comprehensive review of the effects of early injection parameters on the performance and emissions of HCCI and PCCI engines fueled by both diesel and alternative fuels. Various early injection parameters, including injection pressure, injection timing, and injection angle, are discussed. In addition, the effect of the blending ratio of alternative fuels is also summarized. Every change in parameters has its own advantages and disadvantages, which are explained in detail in order to help researchers choose the best early injection parameters for HCCI and PCCI engines.

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Section: Conception Of Hcci and Pcci Combustionmentioning

confidence: 99%

A Review of Early Injection Strategy in Premixed Combustion Engines

Liang

Zhang

et al. 2019

Applied Sciences

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“…Similar effects were observed in research [9] when a small pilot fuel dose was applied. The investigations presented in [10,11] also indicate a reduction of the emission of particulate matter; (b) The results of the investigations presented in [12,13] indicate an improvement in the fuel combustion and consequently a reduction of the fuel consumption through fuel dose division (as compared to a single fuel dose injection); (c) From the investigations presented in [9] results the dependence of the NO x emission from the size of the first fuel dose: a large pilot fuel dose increases the homogeneity of the charge and a reduction of the NO x emission can be obtained through a delay of the injection of the main fuel dose. In a situation when the injection angle of the first fuel dose was increased by 20°-25°a lower emission of HC and CO was observed; (d) Literature analysis [8,13] is related to an engine fitted with an exhaust recirculation system.…”

Section: Introductionmentioning

confidence: 99%

Combustion process shaping by use of different strategies of multiple fuel injection in a CI model engine

Pielecha

Borowski

Czajka

et al. 2014

J Therm Anal Calorim

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Technological advancement in combustion systems of diesel engines triggers the need of fulfilling many contradictory requirements. Among those are such issues as maintenance of environmental standards in terms of the exhaust emissions with a simultaneous preservation of the thermodynamic properties of the combustion process and fuel consumption. The paper discusses the results of research on the influence of the strategies of fuel dose division on the combustion process and operational indexes in a model engine. The paper also contains an exhaust gas analysis conducted with the use of a rapid compression machine. The investigations of the combustion process (development of the self-ignition spots) were conducted using high speed camera. The recorded images related to the period from the onset of the injection to the beginning of the appearance of combustion spots have also been analyzed. The following have been varied: number of doses, size of doses, dwell times and excess air coefficient. The authors performed a comparative analysis of the thermodynamic indexes of the combustion process obtained from the indicator tracings. The achieved results show possibilities of the influencing on the combustion process course and emission of exhaust toxic compounds by application of multiple injection and its properly selected strategy containing proportions in fuel doses and dwell times between them.

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“…Optimizing the fuel-air mixture distribution is one of the countermeasures against the increase in unburned species emissions and combustion noise [10,11,12,13,14,15]. A multiple-injection strategy is the most realistic way to control the mixture distribution.…”

Section: Introductionmentioning

confidence: 99%

Selection of Injection Parameters for Various Engine Speeds in PCCI-Based Diesel Combustion with Multiple Injection

Horibe

Tanaka

Ishiyama

2011

SAE Technical Paper Series

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The objective of this study is to obtain a strategy for adapting injection and exhaust gas recirculation (EGR) conditions to various engine speeds. An experimental study was conducted using a single-cylinder test engine and varying the injection timings of two-stage injection, the injection-quantity ratio, the EGR rate, and the swirl ratio at low (1300 rpm) and high (2300 rpm) engine speeds. When using base injection conditions, the results indicated that problems occurred for the high maximum pressure rise rate at low engine speed and the low thermal efficiency at high engine speed. At low engine speed, retarding the injection timings and increasing the first-injection quantity ratio reduced the maximum pressure rise rate without sacrificing engine performance. At high engine speed, advancing the injection timings improved the thermal efficiency but increased smoke emission. In addition to advancing the injection timings, a decrease of the first-injection quantity ratio reduced smoke emission.

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Advances in Diesel Engine Combustion: Split Combustion

Cited by 12 publications

References 7 publications

A Review of Early Injection Strategy in Premixed Combustion Engines

A Review of Early Injection Strategy in Premixed Combustion Engines

Combustion process shaping by use of different strategies of multiple fuel injection in a CI model engine

Selection of Injection Parameters for Various Engine Speeds in PCCI-Based Diesel Combustion with Multiple Injection

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