Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - using Conventional Gasoline

Dec, John E.; Yang, Yi

doi:10.4271/2010-01-1086

Cited by 280 publications

(145 citation statements)

References 18 publications

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“…By contrast, B7+E10-95 allows shorter and advanced combustion development with higher maximum RoHR, leading to higher IMEP values. In this case, the ringing intensity is also increased but all the values are below 5 MW/m 2 , which was established by Dec and Yang [35] as a proper upper limit to achieve an acceptable combustion noise and knock-free operation. Table 7 depicts the operating parameters at medium load.…”

Section: Low Load Conditionsmentioning

confidence: 98%

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

Benajes

Molina

García

et al. 2015

Energy Conversion and Management

154

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ElsevierBenajes Calvo, JV.; García Martínez, A.; Monsalve Serrano, J. (2015). Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels. Energy Conversion and Management. 99:193-209. doi:10.1016/j.enconman.2015.04.046. Effects of Direct injection timing and Blending Ratio on RCCI combustion with different Low Reactivity FuelsEnergy Conversion and Management, Volume 99, 2015, Pages 193-209. http://dx.doi.org/10.1016/j.enconman.2015 AbstractThis work investigates the effects of the direct injection timing and blending ratio on RCCI performance and engine-out emissions at different engine loads using four low reactivity fuels: E10-95, E10-98, E20-95 and E85 (port fuel injected) and keeping constant the same high reactivity fuel: diesel B7 (direct injected). The experiments were conducted using a heavy-duty single-cylinder research diesel engine adapted for dual-fuel operation. All the tests were carried out at 1200 rpm. To assess the blending ratio effect, the total energy delivered to the cylinder coming from the low reactivity fuel was kept constant for the different fuel blends investigated by adjusting the low reactivity fuel mass as required in each case. In addition, a detailed analysis of the air/fuel mixing process has been developed by means of a 1-D in-house developed spray model.Results suggest that notable higher diesel amount is required to achieve a stable combustion using E85. This fact leads to higher NOx levels and unacceptable ringing intensity. By contrast, EURO VI NOx and soot levels are fulfilled with E20-95, E10-98 and E10-95. Finally, the higher reactivity of E10-95 results in a significant reduction in CO and HC emissions, mainly at low load.

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Section: Low Load Conditionsmentioning

confidence: 98%

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

Benajes

Molina

García

et al. 2015

Energy Conversion and Management

154

View full text Add to dashboard Cite

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“…Both sweeps (intake temperature and EGR) have been performed keeping constant the combustion phasing (CA50) by adjusting the gasoline percentage in the blend as required in each case and keeping constant the rest of the engine settings. In addition two constraints have been taken into account for the tests: NOx and soot under EURO VI limits for HD diesel engines (NOx <0.4 g/kWh and soot <0.01 g/kWh) and ringing intensity (RI) below 5 MW/m 2 , which was established by Dec and Yang [29] as a proper upper limit to achieve an acceptable combustion noise and knock-free operation. In addition to the experimental tests, a computational analysis by means of a CFD code has been conducted in order to better explain the results.…”

Section: Introductionmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

101

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Several studies carried out with the aim of improving the RCCI concept in terms of thermal efficiency conclude that the main cause of the reduced efficiency at light loads is the reduced combustion efficiency. The present study used both a 3D computational model and engine experiments to explore the effect of the oxygen concentration and intake temperature on RCCI combustion efficiency at light load. The experiments were conducted using a single-cylinder heavy-duty research diesel engine adapted for dual fuel operation.Results suggest that it is possible to achieve an improvement of around 1.5% in the combustion efficiency with both strategies studied; the combined effect of intake temperature and in-cylinder fuel blending as well as the combined effect of oxygen concentration and incylinder fuel blending (ICFB). In addition, the direct comparison of both strategies suggests that the combustion losses trend is mainly associated to the in-cylinder equivalence ratio stratification, which is determined by the diesel to gasoline ratio in the blend since the injection timing is kept constant for all the tests. Moreover, the combined effect of the intake temperature and ICFB promotes a slight improvement in the combustion losses over the combined effect of the oxygen concentration and ICFB. KEYWORDS

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“…The effects of intake pressure were also investigated using the skeletal mechanism by changing P in . In previous studies 51,52 , gasoline has shown enhanced ITHR with boosted intake pressure, while ethanol shows no dependence on intake pressure. Figure 11B displays the comparison of intake temperatures of C 5 alcohols to maintain constant combustion phasing with various intake pressures.…”

Section: Skeletal Mechanism For Hcci Simulationmentioning

confidence: 99%

Combustion Characteristics of C₅ Alcohols and a Skeletal Mechanism for Homogeneous Charge Compression Ignition Combustion Simulation

Park

Chung

et al. 2015

Energy Fuels

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KEYWORDS2-methylbutanol, iso-pentanol, ignition delay, intermediate temperature heat release, skeletal mechanism, HCCI engine combustion 2 ABSTRACT C 5 alcohols are considered alternative fuels because they emit less greenhouse gases and fewer harmful pollutants. In this study, the combustion characteristics of 2-methylbutanol (2-methyl-1-butanol) and iso-pentanol (3-methyl-1-butanol) and their mixtures with primary reference fuels (PRFs) were studied using a detailed chemical kinetic model obtained from merging previously published mechanisms. Ignition delay times of the C 5 alcohol/air mixtures were compared with PRFs at 20 and 40 atm. Reaction path analyses were conducted at intermediate and high temperatures to identify the most influential reactions controlling ignition of C 5 alcohols. The direct relation graph with expert knowledge methodology was used to eliminate unimportant species and reactions in the detailed mechanism, and the resulting skeletal mechanism was tested at various homogeneous charge compression ignition (HCCI) engine combustion conditions. These simulations were used to investigate the heat release characteristics of the methylsubstituted C 5 alcohols, and the results show relatively strong reactions at intermediate temperatures prior to hot ignition. C 5 alcohol blending in PRF75 in HCCI combustion leads to a significant decrease of low temperature heat release (LTHR) and a delay the main combustion.The heat release features demonstrated by C 5 alcohols can be used to improve the design and operation of advanced engine technologies.3

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Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - using Conventional Gasoline

Cited by 280 publications

References 18 publications

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Combustion Characteristics of C₅ Alcohols and a Skeletal Mechanism for Homogeneous Charge Compression Ignition Combustion Simulation

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Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - using Conventional Gasoline

Cited by 280 publications

References 18 publications

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Combustion Characteristics of C5 Alcohols and a Skeletal Mechanism for Homogeneous Charge Compression Ignition Combustion Simulation

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Product

Resources

About

Combustion Characteristics of C₅ Alcohols and a Skeletal Mechanism for Homogeneous Charge Compression Ignition Combustion Simulation