Modeling and analysis of fuel injection parameters for combustion and performance of an RCCI engine

Nazemi, Mohammadreza; Shahbakhti, Mahdi

doi:10.1016/j.apenergy.2015.11.093

Cited by 117 publications

(43 citation statements)

References 41 publications

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“…It is seen that the increase in natural gas premixed ratio delays CA10 and the timing of the main combustion phase. This is due to increase in natural gas ratio, being a fuel with high auto-ignition temperature and low reactivity, reduces the reactivity of the in-cylinder charge and as a result delays the start of and the main combustion [17,18]. Furthermore, the reduction in premixed ratio at fixed operating conditions similar to the base case, results in the reduction of the burn duration and the occurrence of a fast combustion.…”

Section: Resultsmentioning

confidence: 99%

Simulation of Dual Fuel Combustion of Direct Injection Engine with Variable Natural Gas Premixed Ratio

Jafari

Khatamnejad

Shahavi

et al. 2019

IJE

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A B S T R A C TNowadays, the major challenge of diesel engines development is simultaneous nitrogen oxides and soot emissions reduction without the thermal efficiency drop. Hence, different combustion concepts should be investigated to reach optimum emission and performance conditions in diesel engines without expensive aftertreatment systems. This paper presents the results of a study on a dual fuel (DF) engine including natural gas and diesel fuel in view of combustion and emissions parameters. The current investigation also supports by 3D-CFD simulation coupled with the chemical kinetics mechanism for detailed investigation. Based on the results, increasing the premixed ratio of natural gas from 50% to 90% causes the combustion shifts toward the expansion stroke. Therefore, the in-cylinder pressure and combustion efficiency decreases. In 90% premixed ratio of natural gas, the non-combustion condition can be observed. This phenomena leads to extremely increase in HC and CO emissions.

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Section: Resultsmentioning

confidence: 99%

Simulation of Dual Fuel Combustion of Direct Injection Engine with Variable Natural Gas Premixed Ratio

Jafari

Khatamnejad

Shahavi

et al. 2019

IJE

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“…The development of advanced combustion mode is also based on heat release analysis, as presented in Reference [7], where a reactivity controlled compression ignition engine was considered. In this case, an opposite influence of the increase of fuel pressure injection, compared to the expected behaviour, was observed, resulting in lower maximum values of heat release and peak pressure, longer ignition delay and combustion duration.…”

Section: Analysis Of Indicated Pressure Diagrams In Recent Literaturementioning

confidence: 99%

“…∆Q is the heat released during a crankshaft rotation ∆θ. The application of the first thermodynamics law to the cylinder gas, assuming complete combustion and neglecting the variation of mass due to fuel injection [25,26], allows us to identify the three terms of Equation (7). The first is related to the measured level of in-cylinder pressure, multiplied for the corresponding variation of instantaneous cylinder volume (computed from the measured crank angle and engine geometry characteristics).…”

Section: Measurement Of In-cylinder Pressure Diagrams and Calculationmentioning

confidence: 99%

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Zamboni

2019

Applied Sciences

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Indicated pressure diagrams were measured during experimental campaigns on the control of fuel injection, turbocharging and hybrid exhaust gas recirculation systems in an automotive downsized diesel engine. Three-part load operating conditions were selected for four test sets, where strategies aimed at the reduction of NOX emissions and fuel consumption, limiting penalties in soot emissions and combustion noise were applied to the selected systems. Processing of in-cylinder pressure signal, its first derivative and curves of the rate of heat release allowed us to evaluate seven parameters related to the combustion centre and duration, maximum values of pressure, heat release and its first derivative, heat released in the premixed phase and a combustion noise indicator. Relationships between these quantities and engine operating, energy and environmental parameters were then obtained by referring to the four test sets. In the paper, the most significant links are presented and discussed, aiming at a better understanding of the influence of control variables on the combustion process and the effects on engine behaviour. The proposed methodology proved to be a consistent tool for this analysis, useful for supporting the application of alternative fuels or advanced combustion modes.

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“…To achieve this, the effect of different variables on RCCI efficiency and emissions has been deeply investigated. In this sense, the engine settings [21] [22], piston geometry [23], compression ratio [24], fuels used [25] [26], auxiliary systems [27] and air management conditions [28] have been optimized. The majority of the investigations found in literature rely on RCCI to achieve NOx values in steady-state conditions below EURO VI regulation (0.4 g/kWh) and soot emissions in the range of 0.1-0.2 FSN [29].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the emissions and performance of two dual-mode RCCI combustion strategies under the World Harmonized Vehicle Cycle (WHVC)

García

Monsalve‐Serrano

Roso

et al. 2017

Energy Conversion and Management

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This work compares the emissions and performance of two dual-mode reactivity controlled compression ignition (RCCI) combustion strategies under the World Harmonized Vehicle Cycle (WHVC), a chassis dynamometer version of the World Harmonized Transient Cycle (WHTC) test proposed by the EURO VI emission regulation for heavy-duty engines. The major difference between the two dual-mode combustion strategies investigated is that, while one of them relies on covering with conventional diesel combustion (CDC) the part of the map that cannot be covered by RCCI regime (RCCI/CDC dual-mode), the other does it relying on dual-fuel diffusion combustion (dualmode dual-fuel). The influence of the gear shifting strategy on the emissions and performance over the WHVC is discussed first. Later, both dual-mode concepts are compared considering the optimal gear shifting strategy. The results suggest that dual-mode dual-fuel concept allows reducing the specific fuel consumption by 7% in average versus RCCI/CDC concept. Moreover, NOx emissions are around 87% lower with dual-mode dual-fuel, meeting the EURO VI requirements without the need for an SCR aftertreatment system. In counterpart, HC and CO emissions are near 2 and 10 times greater, respectively, for dual-mode dual-fuel than for RCCI/CDC.

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Modeling and analysis of fuel injection parameters for combustion and performance of an RCCI engine

Cited by 117 publications

References 41 publications

Simulation of Dual Fuel Combustion of Direct Injection Engine with Variable Natural Gas Premixed Ratio

Simulation of Dual Fuel Combustion of Direct Injection Engine with Variable Natural Gas Premixed Ratio

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Evaluating the emissions and performance of two dual-mode RCCI combustion strategies under the World Harmonized Vehicle Cycle (WHVC)

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