Characterization and Potential of Premixed Dual-Fuel Combustion in a Heavy Duty Natural Gas/Diesel Engine

May, Ian; Pedrozo, Vinícius B.; Zhao, Hua; Cairns, Alasdair; Whelan, Steve; Wong, Hoi Ching; Bennicke, Paul

doi:10.4271/2016-01-0790

Cited by 25 publications

(17 citation statements)

References 31 publications

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“…In view of that, it could be postulated that the effects of the increase of %CH4 on elongating the ignition delay and combustion duration could be eliminated if a certain degree of charge reactivity was attained through the use of sufficient per-injection mass. The resulting intensified combustion takes place very rapidly during a few CAD [14], with the improved flame propagation at high %CH4 brings the CA50 closer to the TDC. It is to the point here to highlight that for adiabatic engines, the optimal CA50 is attained just right at the TDC [10].…”

Section: Resultsmentioning

confidence: 99%

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

Hegab¹,

Shayler²

2017

World Congress on Momentum, Heat and Mass Transfer

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-The development of advanced techniques of diesel engines brings many novel ideas to dual fuel engines, where the key to combustion mode change is essentially the optimization of the pilot injection strategy. Splitting the diesel pilot into a main injection preceded by a pre-injection could bring about a change in the combustion mode from the conventional diesel dual fuel (DDF) combustion to the novel partially premixed dual fuel (PPDF) combustion; if the pre-injection part of the pilot is optimized for timing and quantity. In diesel engines with split injection, the pre-injection part is set to a certain percentage of the total diesel fuel supplied to the engine at the particular operating condition. This could be challenging to PPDF combustion, where the relative proportions of gaseous fuel and diesel could change at the same power level produced. With high levels of gaseous fuel substitution, the mass of diesel pre-injection could drop substantially and potentially lose its effect. The present work aims at investigating the influence of pilot pre-injection mass on PPDF combustion and performance at part load conditions. A comparative study was conducted on a modern automotive direct injection (DI) diesel engine working on PPDF with methane and diesel, between two pre-injection strategies; namely the fixed ratio (FR) and the fixed mass (FM). The tests were performed at different engine speeds ranging from 1400 to 2000 rpm at 25% of the engine load at the particular speed, with different substitution ratios of methane for diesel fuel (from 20 to 80% on energy basis). Cylinder pressure, rate of pressure rise (ROPR), coefficient of variation of gross IMEP (COVIMEPgross), heat release rate (HRR), combustion phasing (CA50), brake thermal efficiency, total equivalence ratio, and total diesel fuel injected; are all studied and compared for both pilot pre-injection strategies.

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Section: Resultsmentioning

confidence: 99%

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

Hegab¹,

Shayler²

2017

World Congress on Momentum, Heat and Mass Transfer

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“…The mixture is ignited by a diesel pilot injection close to top dead centre (TDC). This concept was experimentally studied by Königsson [10], May et al [11] and Garcia and Tunestal [6]. The challenge of this approach is to deal with high HC emissions in low load operation.…”

Section: State Of the Artmentioning

confidence: 99%

“…The direct injection of NG, however, offers an additional degree of freedom-the injection timing of NG. Thus, a stratification of the air-NG mixture becomes feasible and the problem of high HC emissions during low load operation can be mitigated as suggested in [11] and demonstrated in [4,21]. Subsequently, this concept is further elaborated.…”

Section: State Of the Artmentioning

confidence: 99%

A holistic investigation of natural gas–diesel dual fuel combustion with dual direct injection for passenger car applications

Fasching

Sprenger

Granitz

2017

Automot. Engine Technol.

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This publication covers the investigation of a dual fuel combustion process for passenger car applications using natural gas and diesel as fuels. In the literature a widely studied dual fuel concept is the combination of port fuel injection of natural gas and direct injection of diesel. The challenge of this concept is a high emission of unburned hydrocarbons at low load operation as previous publications show. The proposed concept features a low pressure direct injection of natural gas in combination with direct injection of diesel to circumvent this problem. The acronym DDI-dual direct injection is introduced for this concept. It enables charge stratification of the air-natural gas mixture. This allows for a significant reduction of the unburned hydrocarbon emissions as earlier studies already demonstrated. The focus of this publication is on hardware variations which were performed on the engine test bench. Results are presented of a variation of the compression ratio and of different charge motion patterns which were studied. The results are compared with a conventional diesel and a gasoline spark ignited engine. The investigations demonstrate that a CO 2 reduction of 20-29% is feasible as compared to conventional engines. Finally, investigations of exhaust gas aftertreatment with a threeway catalyst are published. The aftertreatment of the remaining engine-out hydrocarbon emissions is still the key challenge due to the low exhaust gas temperature during low load operation.

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“…However, relatively high levels of carbon monoxide (CO) and unburnt hydrocarbon (HC) emissions are usually reported at low engine loads [13]. Furthermore, engine operation at high load conditions have been proved extremely challenging as a result of the peak in-cylinder pressure [14] and/or PRR limitations [15,16], which restrict the amount of low reactivity fuel used to very low percentages.…”

Section: Introductionmentioning

confidence: 99%

Improvement in high load ethanol-diesel dual-fuel combustion by Miller cycle and charge air cooling

Pedrozo

Zhao

2018

Applied Energy

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Characterization and Potential of Premixed Dual-Fuel Combustion in a Heavy Duty Natural Gas/Diesel Engine

Cited by 25 publications

References 31 publications

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

Influence of Pilot Pre-Injection Mass on Partially Premixed Dual Fuel (PPDF) Engine Combustion

A holistic investigation of natural gas–diesel dual fuel combustion with dual direct injection for passenger car applications

Improvement in high load ethanol-diesel dual-fuel combustion by Miller cycle and charge air cooling

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