Simulation of methane autoignition in a rapid compression machine with creviced pistons

Brett, Laura; MacNamara, J.P; Musch, P; Simmie, John M.

doi:10.1016/s0010-2180(00)00193-0

Cited by 88 publications

(55 citation statements)

References 8 publications

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“…The NUIG rapid compression machine (RCM) has a twin opposed piston configuration described previously [23,24], resulting in fast compression of little more than 16 ms.…”

Section: Methodsmentioning

confidence: 99%

Modeling and experimental investigation of methylcyclohexane ignition in a rapid compression machine

Pitz¹,

Naik²,

Mhaoldúin³

et al. 2007

Proceedings of the Combustion Institute

176

234

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A new chemical kinetic reaction mechanism has been developed for the oxidation of methylcyclohexane (MCH), combining a new low-temperature mechanism with a recently developed high temperature mechanism. Predictions from this kinetic model are compared with experimentally measured ignition delay times from a rapid compression machine. Computed results were found to be particularly sensitive to isomerization rates of methylcyclohexylperoxy radicals. Three different methods were used to estimate rate constants for these isomerization reactions. Rate constants based on comparable alkylperoxy radical isomerizations corrected for the differences in the structure of MCH and the respective alkane, predicted ignition delay times in very poor agreement with the experimental results. The most significant drawback was the complete absence of a region of negative temperature coefficient (NTC) in the model results using this method, although a prominent NTC region was observed experimentally. Alternative estimates of the isomerization reaction rate constants, based on the results from previous experimental studies of low temperature cyclohexane oxidation, provided much better agreement with the present experiments, including the pronounced NTC behavior. The most important feature of the resulting methylcyclohexylperoxy radical isomerization reaction analysis was found to be the relative rates of isomerizations that proceed through 5-, 6-, 7-and 8--3-membered transition state ring structures and their different impacts on the chainbranching behavior of the overall mechanism. Theoretical implications of these results are discussed, with particular attention on how intramolecular H atom transfer reactions are influenced by the differences between linear alkane and cycloalkane structures.

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“…The NUIG rapid compression machine (RCM) has a twin opposed piston configuration described previously [23,24], resulting in fast compression of little more than 16 ms.…”

Section: Methodsmentioning

confidence: 99%

Modeling and experimental investigation of methylcyclohexane ignition in a rapid compression machine

Pitz¹,

Naik²,

Mhaoldúin³

et al. 2007

Proceedings of the Combustion Institute

176

234

View full text Add to dashboard Cite

show abstract

“…The heated rapid compression machine used here has been described in detail by Brett et al [31] and Affleck et al [42]. It has a twin opposed piston configuration.…”

Section: Rapid Compression Machinementioning

confidence: 99%

“…These studies cover a wide range of conditions including low-to-high temperatures and pressures. Of these previous ignition delay time studies [26][27][28][29][30][31][32][33][34][35][36][37], only the work of Tang et al [37] included mixtures of CH 4 and DME. It covered dilute mixtures within a pressure range of 1 − 10 atm.…”

Section: Introductionmentioning

confidence: 99%

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Burke

Somers

O’Toole

et al. 2015

Combustion and Flame

397

279

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The development of accurate chemical kinetic models capable of predicting the combustion of methane and dimethyl ether in common combustion environments such as compression ignition engines and gas turbines is important as it provides valuable data and understanding of these fuels under conditions that are difficult and expensive to study in the real combustors. In this work, both experimental and chemical kinetic model-predicted ignition delay time data are provided covering a range of conditions relevant to gas turbine environments (T = 600 − 1600 K, p = 7 − 41 atm, φ = 0.3, 0.5, 1.0, and 2.0 in 'air' mixtures). The detailed chemical kinetic model (Mech 56.54) is capable of accurately predicting this wide range of data, and it is the first mechanism to incorporate high-level rate constant measurements and calculations where available for the reactions of DME. This mechanism is also the first to apply a pressure-dependent treatment to the low-temperature reactions of DME. It has been validated using available literature data including flow reactor, jet-stirred reactor, shock-tube ignition delay times, shock-tube speciation, flame speed, and flame speciation data. New ignition delay time measurements are presented for methane, dimethyl ether, and their mixtures; these data were obtained using three different shock tubes and a rapid compression machine. In addition to the DME/CH 4 blends, high-pressure data for pure DME and pure methane were also obtained. Where possible, the new * address:

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“…Ignition delay times at low temperature were measured using an opposed-piston rapid compression machine originally developed by Affleck and Thomas at Shell-Thornton [27] and re-commissioned at NUIG in the late 1990s [28] [29]. Creviced piston heads, with an inner diameter of 38.2 mm, were used in order to improve the post-compression temperature homogeneity in the combustion chamber [30].…”

Section: Rapid Compression Machinementioning

confidence: 99%

An experimental and modeling study of shock tube and rapid compression machine ignition of n-butylbenzene/air mixtures

Nakamura

Darcy

Mehl

et al. 2014

Combustion and Flame

138

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Simulation of methane autoignition in a rapid compression machine with creviced pistons

Cited by 88 publications

References 8 publications

Modeling and experimental investigation of methylcyclohexane ignition in a rapid compression machine

Modeling and experimental investigation of methylcyclohexane ignition in a rapid compression machine

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

An experimental and modeling study of shock tube and rapid compression machine ignition of n-butylbenzene/air mixtures

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