Potential of Concomitant Injection of CNG and Gasoline on a 1.6L Gasoline Direct Injection Turbocharged Engine

Obiols, Jerome; Soleri, Dominique; Dioc, Nathalie; Moreau, Marc

doi:10.4271/2011-01-1995

Cited by 29 publications

(7 citation statements)

References 11 publications

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“…It is also notable that the low ignitability and low flame speed of methane (the main component of natural gas) pose great challenges for its utilization in combustion engines [1]. Therefore, a combination of gasoline and CNG has been proposed as an alternative fuel in SI engines to utilize advantages of both fuels [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Baloo

Dariani

Akhlaghi

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Baloo

Dariani

Akhlaghi

et al. 2015

Fuel

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“…5) Consequently, (A1. 6) In an engine environment A f will be also affected by the turbulence characteristics,…”

Section: Appendices Appendix A1mentioning

confidence: 99%

“…A blend with 25% of its energy contributing from methane was labelled as DF25, with 50% DF50, and for 75% DF75. (6) Three different equivalence ratios have been tested (0.8, 1, 1.2). The different equivalence ratios have been calculated using the method of chemical balance and assuming products of complete combustion.…”

Section: Dual Fuel Mixture Preparationmentioning

confidence: 99%

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Experimental Study on the Burning Rate of Methane and PRF95 Dual Fuels

Petrakides¹,

Gao²,

Chen³

et al. 2016

SAE Int. J. Engines

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Natural gas as an alternative fuel offers the potential of clean combustion and emits relatively low CO 2 emissions. The main constitute of natural gas is methane. Historically, the slow burning speed of methane has been a major concern for automotive applications.Literature on experimental methane-gasoline Dual Fuel (DF) studies on research engines showed that the DF strategy is improving methane combustion, leading to an enhanced initial establishment of burning speed even compared to that of gasoline. The mechanism of such an effect remains unclear.In the present study, pure methane (representing natural gas) and PRF95 (representing gasoline) were supplied to a constant volume combustion vessel to produce a DF air mixture. Methane was added to PRF95 in three different energy ratios 25%, 50% and 75%. Experiments have been conducted at equivalence ratios of 0.8, 1, 1.2, initial pressures of 2.5, 5 and 10 bar and a temperature of 373K. At stoichiometric conditions, experiments in an SI engine have been also performed.It has been found that methane and all DFs have their fastest burning rate at stoichiometric conditions whereas PRF95 at rich conditions (Φ=1.2). At lean conditions (Φ=0.8), all DFs resulted in faster combustion than PRF95, whereas methane is the slowest of all. At rich conditions, DF75 and DF50 are slower than methane. The transition mechanism between the constant volume combustion experiments and those in the engine environment resulted in a larger increase in the burning speed of methane and all DFs in comparison to that of the liquid fuel. CITATION:

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“…Obiols et al [9] investigated the effects of gasoline and CNG mixed injection in a turbocharged spark ignition engine with direct injection of gasoline inside cylinders and port injection of CNG in the intake manifold. They strengthened valve seats for erosion prevention at high thermal loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of CNG and gasoline fuels combination on a 1.7 L bi-fuel turbocharged engine

Tabar

Hamidi

Ghadamian

2016

Int J Energy Environ Eng

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In this paper, the potential of combined injection of CNG and gasoline is studied on a 1.7 L turbocharged, port-injected SI engine and the best engine performance point for the best conversion efficiency of the catalytic converters has been investigated. Compressed natural gas (CNG) as an alternative fuel is used in spark ignition engines to improve fuel consumption and exhaust emissions. The improvements gave more advantage in emission but it lowered the performance of the engine. As a substitute, CNG has a higher octane number and knocking resistance than gasoline and hence CNG-dedicated engines can have higher compression ratios and therefore higher indicated efficiencies. Turbocharged bi-fuel, combined CNG and gasoline, injection engine of is a new concept which offers direct benefits with regards to gas or gasoline powered vehicles running separately on each fuels. It also opens very interesting perspectives for meeting future emission regulations using only a three-way catalyst, since the stoichiometry condition of combustion is maintained over the whole engine operating range. Results show that the combined injection of gasoline and CNG is much better than gasoline mode in terms of fuel consumption and raw HC and CO emissions. However, as expected the NO x emission will increase. According to the obtained results at 16.2 bar BMEP, 3000 rpm full load condition with 30% CNG mass fraction, the BSFC, CO and HC emissions are improved by 16, 66 and 50%, respectively, compared to gasoline single mode. It was found that a fuel mixture of 30% CNG mass fraction was the best trade-off point between engine performance and emission production. Also, significant reductions of fuel consumption were observed. Full-load tests carried out with a turbocharged engine enhanced the synergy effect between the two fuels at fullload condition.

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Potential of Concomitant Injection of CNG and Gasoline on a 1.6L Gasoline Direct Injection Turbocharged Engine

Cited by 29 publications

References 11 publications

Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Effect of iso-octane/methane blend on laminar burning velocity and flame instability

Experimental Study on the Burning Rate of Methane and PRF95 Dual Fuels

Experimental investigation of CNG and gasoline fuels combination on a 1.7 L bi-fuel turbocharged engine

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