Dilution Interest on Turbocharged SI Engine Combustion

Graphical Abstract AbstractExhaust gas fuel reforming has been identified as a thermochemical energy recovery technology with potential to improve gasoline engine efficiency, and thereby reduce CO2 in addition to other gaseous and particulate matter (PM) emissions. The principle relies on achieving energy recovery from the hot exhaust stream by endothermic catalytic reforming of gasoline and a fraction of the engine exhaust gas. The hydrogen-rich reformate has higher enthalpy than the gasoline fed to the reformer and is recirculated to the intake manifold, i.e. reformed exhaust gas recirculation (REGR).The REGR system was simulated by supplying hydrogen and carbon monoxide (CO) into a conventional EGR system. The hydrogen and CO concentrations in the REGR stream were selected to be achievable in practice at typical gasoline exhaust temperatures. Emphasis was placed on comparing REGR to the baseline gasoline engine, and also to conventional EGR. The results demonstrate the potential of REGR to simultaneously increase thermal efficiency, reduce gaseous emissions and decrease PM formation.

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“…This agrees with previous research that has shown EGR dilution [15,32,33] and hydrogen enhancement [8,34] to be effective for attenuating knock.…”

Section: Estimated Exhaust Stream Hydrogen Concentration H2ex (Ppm)supporting

confidence: 82%

Improving gasoline direct injection (GDI) engine efficiency and emissions with hydrogen from exhaust gas fuel reforming

Fennell

Herreros

Tsolakis

2014

International Journal of Hydrogen Energy

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“…Although combustion stability was observed to deteriorate in each case, it was apparent that eGr facilitated the more stable burn and presented significant advantages in terms of reducing emissions of nitrous oxides (nO x ). in an alternative but similar study in a turbocharged four-cylinder 2.0-litre unit, Duchaussoy et al (20) concluded that introducing EGR provided significant benefits over excess air dilution in terms of transient turbocharged engine operation, with a smaller increase in compressor size required. Specific details of the preto-post compressor EGR feed ratio (with the flow divided via a three-way valve) were not provided.…”

Section: 1mentioning

confidence: 97%

Exhaust gas recirculation boosted direct injection gasoline engines

Cairns

Blaxill

Fraser

2010

Advanced Direct Injection Combustion Engine Technologies and Development

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“…The use of exhaust gas recirculation (EGR) in spark-ignited (SI) engines effectively reduces in-cylinder NOx emissions through a reduction of the combustion temperature [1][2][3][4][5]. Moreover, employing high levels of EGR (EGR percentage > 15%) has the potential of increasing the fuel efficiency [2], reducing knock [6][7][8][9], and reducing the emissions of CO [7] and particulate matter [10,11]. Dedicated EGR (D-EGR) is an SI engine concept that reforms the fuel composition and is capable of providing elevated EGR levels [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen and Carbon Monoxide Addition to Methane on Laminar Burning Velocity

Morovatiyan

Shahsavan

Baghirzade

et al. 2019

ASME 2019 Internal Combustion Engine Division Fall Technical Conference

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Exhaust gas recirculation (EGR) in spark-ignited engines is a key technique to reduce in-cylinder NOx production by decreasing the combustion temperature. The major species of the exhaust gas in rich combustion of natural gas are hydrogen and carbon monoxide, which can subsequently be recirculated to the cylinders using EGR. In this study, the effect of hydrogen and carbon monoxide addition to methane on laminar burning velocity and flame morphological structure is investigated. Due to the broad flammability limit and high burning velocity of hydrogen compared to methane, this addition to the gaseous mixture leads to an increase in burning velocity, less emissions production, and a boost to the thermal efficiency of internal combustion engines. Premixed CH4-H2-CO-Air flames are experimentally investigated using an optically accessible constant volume combustion chamber (CVCC) accompanied with a high-speed Z-type Schlieren imaging system. Furthermore, a numerical code is applied to quantify the laminar burning velocity based on the pressure rise during flame propagation within the CVCC. According to the empirical and numerical results, the addition of hydrogen and carbon monoxide enhances laminar burning velocity while influencing the flame structure and development.

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Dilution Interest on Turbocharged SI Engine Combustion

Cited by 71 publications

References 6 publications

Improving gasoline direct injection (GDI) engine efficiency and emissions with hydrogen from exhaust gas fuel reforming

Improving gasoline direct injection (GDI) engine efficiency and emissions with hydrogen from exhaust gas fuel reforming

Exhaust gas recirculation boosted direct injection gasoline engines

Effect of Hydrogen and Carbon Monoxide Addition to Methane on Laminar Burning Velocity

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