The oxidation of weak methane-air mixtures at high temperatures

Simonson, J. R.; Moore, Niamh

doi:10.1016/s0082-0784(55)80060-4

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Multiple ignition and extinction with up to five solutions were found to exist under some conditions. Experimentally, preignition glow was observed 7–9.…”

Section: Double Turning With Reference Mechanismmentioning

confidence: 98%

Multiple criticality and staged ignition of methane in the counterflow

Liu

Law

2009

Int J of Chemical Kinetics

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The counterflow ignition of methane was investigated, with particular interest in the role of radical versus thermal runaway. Simulation with different kinetic mechanisms showed that the ignition response is qualitatively sensitive to the kinetic mechanism adopted, either exhibiting or not exhibiting two ignition turning points in the S-curve response. For the former situation, ignition could take place in a staged manner with either increasing temperature or decreasing strain rate of the counterflow, characterized by the first ignition event being radical induced with negligible thermal effect and the second ignition event requiring thermal feedback. Sensitivity analysis and a recently developed chemical explosive mode analysis were performed to identify the dominant reactions in the radical runaway stage, revealing the importance of branching pathways involving the HO 2 radical. Counterflow experiments were also conducted, yielding useful information on the ignition response. The study identifies items of further research to sharpen the comprehensiveness and accuracy of the methane oxidation mechanism.

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“…Multiple ignition and extinction with up to five solutions were found to exist under some conditions. Experimentally, preignition glow was observed 7–9.…”

Section: Double Turning With Reference Mechanismmentioning

confidence: 98%

Multiple criticality and staged ignition of methane in the counterflow

Liu

Law

2009

Int J of Chemical Kinetics

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“…Previous research on oxidation of methane in a motored engine dealt chiefly with relatively lean mixtures (3. 8).…”

Section: Rapid Quenchingmentioning

confidence: 99%

Chemicals from Methane in a High Compression Engine

Oberdorfer¹,

Winch²

1961

Ind. Eng. Chem.

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Comparative Studies of Methane and Propane as Engine Fuels

Moore

Roy

1956

Proceedings of the Institution of Mechanical Engineers

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The performance of a single-cylinder, high-speed, spark-ignition engine has been studied with gaseous methane and propane as fuels. The power output and thermal efficiencies have been determined at two compression ratios, 55/1 and loll. A comparison for the same engine using liquid fuels is given in Appendix I. Both fuels will knock at high compression ratios; the limits have been determined for all ignitable mixture ratios, and also the effect of inlet temperatures has been studied. Both fuels are 'temperature sensitive', the effect being most marked with methane. An experimental comparison has been made of the auto-ignition limits of both fuels by the motoredengine method. Both fuels have been shown to give a stable region of visible cool-flame-type pre-reaction below the temperature for complete ignition. Despite the differing ignition temperature and pressure relationship determined by static experiments, a close similarity is revealed by autoignition experiments in the engine. Possible explanations of the differing effects are considered. Infra-red absorption gas analysis has been used to detect the small quantities of methane in the exhaust gas surviving combustion. A very low and constant concentration of methane is present with fast-burning mixtures, owing, it is believed, to valve overlap and scavenge effects. As the rich and weak misture limits for steady running are approached unburnt methane increases in the exhaust, the effect being most marked near the weak limit. These effects are relevant to problems of atmospheric pollution from engixie exhausts, and also assist in assigning the fall in engine efficiency at weak mixtures primarily to combustion inefficiency.Both methane and propane are shown to be suitable fuels for high-compression-ratio gas engines. Consideration of the combustion properties of these two pure hydrocarbons of simple structure is also of interest in extending the understanding of the general problem of engine knock.

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The oxidation of weak methane-air mixtures at high temperatures

Cited by 4 publications

References 5 publications

Multiple criticality and staged ignition of methane in the counterflow

Multiple criticality and staged ignition of methane in the counterflow

Chemicals from Methane in a High Compression Engine

Comparative Studies of Methane and Propane as Engine Fuels

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