Potential for Improving the Efficiency of a Spark Ignition Engine for Natural Gas Fuel

Fleming, Raymond; O'Neal, Glenn B.

doi:10.4271/852073

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…By the way, Fleming and O'Neal [15] noted that aldehydes, which have very high MIR factors, were gener-ated from the natural gas and, although they were not aected by a change of compression ratio, seriously increased in the lean mixture conditions. The measurements of aldehyde emissions could show dierent trends in SR and BSR under lean mixture conditions, but unfortunately equipment was not available for such measurements.…”

Section: Eects Of Mixture Strength In Lean Mixturesmentioning

confidence: 99%

“…These results suggest that EGR mainly reduces NO x emissions without aecting the HC emissions. Heywood [14] and Fleming and O'Neal [15] noted that the introduction of a large EGR at the stoichiometric condition not only reduced the NO x emissions but also increased the eciency, which is as much as that in lean burn conditions. This is due to the reductions of the pumping loss, the heat loss to the wall and the degree of dissociation resulting from the low combustion temperature.…”

Section: Eects Of Spark Timingmentioning

confidence: 99%

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Speciated hydrocarbon emissions from a gas-fuelled spark-ignition engine with various operating parameters

Kim

Bae

2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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For natural gas and liquefied petroleum gas (LPG), measurements of the concentrations of individual exhaust hydrocarbon (HC) species have been made under various engine operating conditions in a 2 litre four-cylinder engine using gas chromatography. Non-methane hydrocarbon (NMHC) in addition to the species of HC and other emissions such as CO2, CO and NOx were examined for natural gas and LPG at 1800 r/min for two compression ratios (8.6 and 10.6), various brake mean effective pressure (b.m.e.p.) values (250-800 kPa), spark timings (before top dead centre 10°-55°) and exhaust gas recirculation ratios up to 7 per cent. Fuel conversion efficiencies were also investigated together with emissions to study the effect of engine parameters on the combustion performance in gas engines, especially under the lean burn conditions. It was found that CO2 emission decreased with smaller C value of fuel, leaner mixture strength, higher compression ratio, higher b.m.e.p. and the ignition near the maximum brake torque spark timing. HC emissions from the LPG engine consisted primarily of propane (C3 H8) (more than 60 per cent), ethylene and propylene (C3 H6), while the main emissions from natural gas were methane (more than 60 per cent), ethane, ethylene and propane. Natural gas was shown to have less of a tendency to form ozone than LPG. This was accomplished by reducing the emissions of propylene, which has a relatively high maximum incremental reactivity factor, and propane, which forms a large portion of LPG. In addition, natural gas shows a benefit in the other emissions (i.e. NMHC, NOx and CO2), specific reactivity and brake specific reactivity values except fuel conversion efficiency.

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Section: Eects Of Mixture Strength In Lean Mixturesmentioning

confidence: 99%

Section: Eects Of Spark Timingmentioning

confidence: 99%

Speciated hydrocarbon emissions from a gas-fuelled spark-ignition engine with various operating parameters

Kim

Bae

2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…This device allowed controlled loading to be applied to the engine. A Ford Kent 1600 cm 3 4-cylinder 4-stroke cross flow unit engine was selected. The power unit has an overhead valve design with a compression ratio of 9:1.…”

Section: Engine Test Rigmentioning

confidence: 99%

“…Natural gas has considerable potential as a 'clean' fuel for motor vehicles. It offers a number of technical and economic advantages, such as extremely low photochemical reactivity, zero evaporative emissions, reduced cold-start and low temperature emissions due to the elimination of cold enrichment and ready availability at a low cost [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Design of combustion sensory based controller for natural gas engines

Nwagboso¹,

Pendlebury²,

Mukarram³

2003

Meas. Sci. Technol.

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Concern over the ever-increasing stringent emission requirements and rising fuel costs has resulted in closer examination of the control of combustion in internal combustion engines. Natural gas is becoming a viable alternative fuel source, diversifying the transport fuel base, and a fuel potentially offering efficiency and environmental pollution benefits, compared with conventional fuels. Although the potential benefits of the fuel are acknowledged, there are clearly identifiable shortcomings in the control technology applied to the fuel and ignition management system. This paper presents the design of a novel sensing scheme with a fibre optic sensory system capable of monitoring the combustion event in a natural gas engine with minimal invasiveness. The optical sensory system is compared with a pressure sensory signal and used to analyse mass fraction burn and heat release. An integrated ignition controller is presented that enables the ignition angle to be modified, based on the measured optical combustion signal, with a control technique to provide an optimal management of the engine performance.

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Effect of compression ratio and hydrogen addition on part throttle performance of a LPG fuelled lean burn spark ignition engine

Ravi

Bhasker

Porpatham

2017

Fuel

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Potential for Improving the Efficiency of a Spark Ignition Engine for Natural Gas Fuel

Cited by 15 publications

References 5 publications

Speciated hydrocarbon emissions from a gas-fuelled spark-ignition engine with various operating parameters

Speciated hydrocarbon emissions from a gas-fuelled spark-ignition engine with various operating parameters

Design of combustion sensory based controller for natural gas engines

Effect of compression ratio and hydrogen addition on part throttle performance of a LPG fuelled lean burn spark ignition engine

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