Reactivity Controlled Compression Ignition (RCCI) Heavy-Duty Engine Operation at Mid-and High-Loads with Conventional and Alternative Fuels

Splitter, Derek; Hanson, Reed; Kokjohn, Sage; Reitz, Rolf D.

doi:10.4271/2011-01-0363

Cited by 297 publications

(127 citation statements)

References 44 publications

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“…The quenching effect of mixtures near wall and crevice regions is the major source of UHC and CO emissions [12]. As can be seen from Fig.5, the UHC and CO emissions increased gradually with increasing proportions of port fuel under both loads.…”

Section: Effects Of Premixed Ratios On Emissionsmentioning

confidence: 53%

See 1 more Smart Citation

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Dong¹,

Cheng²,

Ou³

2017

Proceedings of the 2016 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016)

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Abstract. Experiments and simulations were conducted to investigate the combustion and emission characteristics of ethanol/diesel dual-fuel combustion. The experiments were performed on a light-duty diesel engine with direct injection of diesel combined with port injection of ethanol. The results showed that the ethanol/diesel dual-fuel mode could reduce soot and NOx emissions simultaneously without EGR even at the higher load. However, the UHC and CO emissions of the ethanol/diesel dual-fuel mode increased gradually with the increase of ethanol proportion. Simulations showed that high UHC and CO emissions were formed in the crevice regions as well as cylinder center due to the lower reactivity of ethanol. It was also found that the cyclic variations of the ethanol/diesel dual-fuel mode increased gradually with the increase of premixed ratio at both loads. This was mainly due to the lower reactivity of ethanol.

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Section: Effects Of Premixed Ratios On Emissionsmentioning

confidence: 53%

“…To meet these challenges, researchers have proposed the concept of dual-fuel PCI combustion, such as Reactivity Controlled Compression Ignition (RCCI) [4]- [7]. Many studies have shown that dual-fuel PCI can simultaneously reduce soot and NOx with good control of heat release rate [8]- [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Dong¹,

Cheng²,

Ou³

2017

Proceedings of the 2016 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016)

View full text Add to dashboard Cite

show abstract

“…In contrast to the conventional Diesel pilot ignition, the Diesel is injected early in the compression phase with either multiple injections or one single injection. RCCI has proven to be effective in achieving high fuel efficiency and low pollutant emissions [9][10][11][12].…”

Section: Motivationmentioning

confidence: 99%

Low-Load Limit in a Diesel-Ignited Gas Engine

et al. 2017

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Abstract:The lean-burn capability of the Diesel-ignited gas engine combined with its potential for high efficiency and low CO 2 emissions makes this engine concept one of the most promising alternative fuel converters for passenger cars. Instead of using a spark plug, the ignition relies on the compression-ignited Diesel fuel providing ignition centers for the homogeneous air-gas mixture. In this study the amount of Diesel is reduced to the minimum amount required for the desired ignition. The low-load operation of such an engine is known to be challenging, as hydrocarbon (HC) emissions rise. The objective of this study is to develop optimal low-load operation strategies for the input variables equivalence ratio and exhaust gas recirculation (EGR) rate. A physical engine model helps to investigate three important limitations, namely maximum acceptable HC emissions, minimal CO 2 reduction, and minimal exhaust gas temperature. An important finding is the fact that the high HC emissions under low-load and lean conditions are a consequence of the inability to raise the gas equivalence ratio resulting in a poor flame propagation. The simulations on the various low-load strategies reveal the conflicting demand of lean combustion with low CO 2 emissions and stoichiometric operation with low HC emissions, as well as the minimal feasible dual-fuel load of 3.2 bar brake mean effective pressure.

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“…The RCCI concept, as shown in Fig. 1, has an advantage over many other advanced combustion strategies [4][5][6][7][8][9][10][11][12][13][14][15][16] in that the fuel reactivity can be tailored to the engine speed and load, allowing stable, low-temperature combustion (LTC) operation to be extended over more of the light-duty drive cycle load range [17,18].…”

Section: Introductionmentioning

confidence: 99%

The Contribution of Lubricant to the Formation of Particulate Matter with Reactivity Controlled Compression Ignition in Light-Duty Diesel Engines

Storey

Curran

Dempsey

et al. 2014

Emiss. Control Sci. Technol.

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Reactivity controlled compression ignition (RCCI) has been shown in single-and multi-cylinder engine research to achieve high thermal efficiencies with ultra-low NO X and soot emissions. The nature of the particulate matter (PM) produced by RCCI operation has been shown in recent research to be different than that of conventional diesel combustion and even diesel low-temperature combustion. Previous research has shown that the PM from RCCI operation contains a large amount of organic material that is volatile and semi-volatile. However, it is unclear if the organic compounds are stemming from fuel or lubricant oil. The PM emissions from dual-fuel RCCI were investigated in this study using two engine platforms, with an emphasis on the potential contribution of lubricant. Both engine platforms used the same base General Motors (GM) 1.9-L diesel engine geometry. The first study was conducted on a single-cylinder research engine with primary reference fuels (PRFs), n-heptane, and iso-octane. The second study was conducted on a four-cylinder GM 1.9-L ZDTH engine which was modified with a port fuel injection (PFI) system while maintaining the stock direct injection fuel system. Multi-cylinder RCCI experiments were run with PFI gasoline and direct injection of 2-ethylhexyl nitrate (EHN) mixed with gasoline at 5 % EHN by volume. In addition, comparison cases of conventional diesel combustion (CDC) were performed. Particulate size distributions were measured, and PM filter samples were collected for analysis of lube oil components. Triplicate PM filter samples (i.e., three individual filter samples) for both gas chromatography-mass spectroscopy (GC-MS; organic) analysis and X-ray fluorescence (XRF; metals) were obtained at each operating point and queued for analysis of both organic species and lubricant metals. The results give a clear indication that lubricants do not contribute significantly to the formation of RCCI PM.

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Reactivity Controlled Compression Ignition (RCCI) Heavy-Duty Engine Operation at Mid-and High-Loads with Conventional and Alternative Fuels

Cited by 297 publications

References 44 publications

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Low-Load Limit in a Diesel-Ignited Gas Engine

The Contribution of Lubricant to the Formation of Particulate Matter with Reactivity Controlled Compression Ignition in Light-Duty Diesel Engines

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