Experimental Investigation on different Injection Strategies for Ethanol Partially Premixed Combustion

Kaiadi, Mehrzad; Johansson, Bengt; Lundgren, Marcus; Gaynor, John A.

doi:10.4271/2013-01-0281

Cited by 34 publications

(20 citation statements)

References 14 publications

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“…The tests revealed that η t reduces slightly from 0.30 to 0.28 with the higher intake temperature for the single injection case and from 0.26 to 0.24 for the split injection case. The behavior of thermodynamic efficiency is similar to that in the study of Kaiadi et al Higher exhaust losses with higher intake temperature can be the reason for this reduction. η GIE shows the same behavior as η t .…”

Section: Results and Discussionsupporting

confidence: 90%

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

et al. 2019

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Methanol has unique properties as a fuel, and partially premixed combustion has promising results with high engine efficiency and low emissions. Low load studies with methanol partially premixed combustion are scarce, and the effect of intake temperature on low load methanol partially premixed combustion still remains an intriguing question. This study aims to investigate the effect of intake temperature on low load limitations of methanol partially premixed combustion by an experimental study. The engine was operated at 800 rpm under two different loads. The low load condition was performed at 3 bar Indicated mean effective pressure (IMEP), and the idle condition was commenced at 1 bar IMEP. From the results, it was seen that the intake temperature affected engine stability, engine performance, and engine emissions. The combustion stability decreased with the decrease of intake temperature. The ignition delay became longer and the peak cylinder pressure became smaller with lower intake temperature. The combustion efficiency reduced with the decrease of intake temperature from 0.99 to 0.96 at 3 bar IMEP, whereas it decreased from 0.99 to 0.98 at 1 bar IMEP for the single injection case and the split injection case. The thermodynamic efficiency remained constant at 0.43 at 3 bar IMEP, decreased from 0.30 to 0.28 at 1 bar IMEP for the single injection case, and reduced from 0.26 to 0.24 at 1 bar IMEP for the split injection case. The gross indicated efficiency increased from 0.41 to 0.42 at 3 bar IMEP, whereas it reduced from 0.29 to 0.28 and 0.26–0.24 at 1 bar IMEP at single injection and split injection, respectively. Total hydrocarbon emission increased, NO X emission decreased or remained constant, and CO emission remained constant with the decrease in intake temperature. Finally, the combustion phasing study was performed at 1 bar IMEP at constant intake temperature to determine the effect of the start of injection timing on the engine’s performance and the emissions under the idle condition.

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Section: Results and Discussionsupporting

confidence: 90%

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

et al. 2019

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“…A drawback of PPC is combustion noise, which is higher than in conventional diesel combustion due to the higher pressure-rise rate [10]. Reported strategies to mitigate noise in PPC are multiple injection [11], EGR and optimization of the injection profile [12]. In-cylinder fuel stratification is key in PPC [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Tanov

Salvador-Iborra

Andersson

et al. 2017

Energy Conversion and Management

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“…Recent investigations have shown that the use of a multiple injection strategy allows precise control of the fuel-air stratification before the SoC, which affects the timing and strength of auto-ignition as well as the rate and completeness of fuel oxidation throughout the combustion chamber [35,[43][44][45]. Moreover, Sellnau et al confirmed the potential of a triple injection strategy for increasing thermal efficiency compared to single injection strategies thanks to reduced heat losses during the expansion stroke given by a more favorable fuel distribution during combustion which results in less contact between hot combustion gases and chamber walls [38,39].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Multiple Injection Strategies for Gasoline PPC Operation in a Newly Designed 2-Stroke HSDI Compression Ignition Engine

Benajes

Lima

Tribotté

2015

SAE Int. J. Engines

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Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven its potential to achieve simultaneous reduction in soot and NOX emissions, combined with high indicated efficiencies; while still retaining proper control over combustion phasing with the injection event, contrary to fully premixed strategies. However, gasoline fuels with high octane number as the commonly available for the public provide a challenge to ensure reliable ignition especially in the low load range, while fuel blends with lower octane numbers present problems for extending the ignition delay in the high load range and avoid the onset of knocking-like combustion. Thus, choosing an appropriate fuel and injection strategy is critical to solve these issues, assuring successful PPC operation in the full engine map.In this framework, the objective of the present investigation consists of evaluating the use of multiple injection strategies for achieving stable PPC operation, attaining low NOX and soot emissions together with high efficiencies. This research was carried out in a singlecylinder DOHC 2-stroke HSDI CI engine using 95 Research Octane Number (RON) gasoline fuel. Three different operating conditions in terms of indicated mean effective pressure (IMEP) and speed were investigated: 3.1 bar IMEP and 1250 rpm, 5.5 bar IMEP and 1500 rpm and 10.4 bar IMEP and 1500 rpm. Parametric variations of injection timings, at different rail pressures and different fuel split between injections were experimentally performed to analyze the effect of the injection strategy over the combustion process, exhaust emissions and efficiency levels.Experimental results confirm how using an appropriate injection strategy helps to achieve stable PPC operation in the selected operating conditions; with competitive combustion stability, lower NOX and soot levels, and moderate CO and HC emissions with combustion efficiency over 96%, compared to Conventional Diesel Combustion (CDC).Finally, a detailed analysis of the local cylinder conditions was performed by means of 3D-CFD simulations in order to provide guidelines for further optimization of the gasoline PPC concept, when using multiple injection strategies in the 2-stroke engine under development.

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Experimental Investigation on different Injection Strategies for Ethanol Partially Premixed Combustion

Cited by 34 publications

References 14 publications

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

Influence of the number of injections on piston heat rejection under low temperature combustion conditions in an optical compression-ignition engine

Investigation on Multiple Injection Strategies for Gasoline PPC Operation in a Newly Designed 2-Stroke HSDI Compression Ignition Engine

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