Combustion and ignition chemistry in internal combustion engines

Reitz, Rolf D.

doi:10.1177/1468087413498047

Cited by 18 publications

(3 citation statements)

References 27 publications

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“…Combustion progresses sequentially from the highreactivity regions to low-reactivity regions, thereby effectively lowering PRR. 87,88 In addition, flame propagation plays a negligible role during the RCCI combustion process due to the very lean equivalence ratios. 38 In-cylinder reactivity gradients have been successfully measured at the Sandia National Laboratories in order to provide better insight into the combustion process, as depicted in Figure 12.…”

Section: Rccimentioning

confidence: 99%

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Progress and recent trends in reactivity-controlled compression ignition engines

Paykani

Kakaee

Rahnama

et al. 2015

International Journal of Engine Research

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174

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Low-temperature combustion is an emerging engine technology that has the ability to yield low NO x and soot emissions while maintaining high fuel efficiency. Low-temperature combustion strategies include homogeneous charge compression ignition, premixed charge compression ignition, reactivity-controlled compression ignition and partially premixed combustion. These low-temperature combustion strategies use early fuel injections to allow sufficient time for air-fuel mixing before combustion. According to the literature, some low-temperature combustion strategies are not promising for future automotive and power generation applications due to difficulties in controlling the heat release rate and the lack of a combustion phasing control mechanism. To mitigate these problems, the reactivity-controlled compression ignition combustion concept was introduced. Reactivity-controlled compression ignition is a dual-fuel partially premixed combustion concept, which uses port fuel injection of a low-reactivity fuel (e.g. gasoline, natural gas and alcohol fuels) and direct injection of a high-reactivity fuel (e.g. diesel and biodiesel) with blending inside the combustion chamber to increase the combustion duration and to provide phasing control. Combustion phasing is controlled by the relative ratios of the two fuels, and the combustion duration is controlled by spatial stratification between the two fuels. This article begins by an overview of the different low-temperature combustion strategies and demonstrates some advantages of reactivitycontrolled compression ignition, over homogeneous charge compression ignition and premixed charge compression ignition combustion strategies in regard to fuel flexibility and combustion controllability. A comprehensive review of recent research on various aspects of reactivity-controlled compression ignition and comparisons of thermal efficiency and pollutant emissions over conventional diesel combustion is also presented. This article presents the significance of reactivity-controlled compression ignition strategy as a promising solution for future automotive engines and discusses future research directions.

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Section: Rccimentioning

confidence: 99%

“…Combustion progresses sequentially from the high-reactivity regions to low-reactivity regions, thereby effectively lowering PRR. 87,88 In addition, flame propagation plays a negligible role during the RCCI combustion process due to the very lean equivalence ratios. 38…”

Section: Ltcmentioning

confidence: 99%

Progress and recent trends in reactivity-controlled compression ignition engines

Paykani

Kakaee

Rahnama

et al. 2015

International Journal of Engine Research

Self Cite

174

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“…The concept of low-temperature combustion (LTC) has been studied by the engine research community for more than a decade. 4,5 The goal for these combustion modes is to create a lean/dilute mixture that keeps the cylinder temperature adequately low to prevent NO x formation, and this lean mixture also benefits the thermal efficiencies due to the higher ratio of specific heats. Meanwhile, the mixture is mostly premixed, which avoids soot and NO x emissions from the locally rich regions that have high-temperature oxidation.…”

Section: Introductionmentioning

confidence: 99%

Improving the controllability of partial fuel stratification at low boost levels by applying a double late injection strategy

Yan

Gainey

Hariharan

et al. 2020

International Journal of Engine Research

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This experimental study has two objectives. The first objective is to investigate the combustion performance of partial fuel stratification on a high compression ratio, light-duty diesel engine at a practical boost level of 1.6 bar. The second objective is to study the effects of a double late injection strategy on the ϕ-stratification gradient and combustion performance of partial fuel stratification, and verify the improvement in controllability with insufficient gasoline phi-sensitivity (i.e. gasoline does not exhibit strong phi-sensitivity at lower pressure conditions). The total targeted fuel flow rate was 16 mg/cycle throughout all of the experiments. Consequently, the global charge–mass equivalence ratio was fixed at 0.35. In order to investigate the combustion performance, start of injection timing sweeps were performed from –140° to –40° after top dead center, with the split fraction (i.e. the premixed fuel portion) varying from 70% to 90%. The combustion phasing was fixed at 8.6° after top dead center by adjusting the exhaust gas recirculation rate.

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Low temperature combustion

Ju¹,

Wang²

2023

Combustion Chemistry and the Carbon Neutral Future

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Combustion and ignition chemistry in internal combustion engines

Cited by 18 publications

References 27 publications

Progress and recent trends in reactivity-controlled compression ignition engines

Progress and recent trends in reactivity-controlled compression ignition engines

Improving the controllability of partial fuel stratification at low boost levels by applying a double late injection strategy

Low temperature combustion

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