The oxidation and ignition of dimethylether from low to high temperature (500–1600 K): Experiments and kinetic modeling

Dagaut, Philippe; Daly, Claire; Simmie, John M.; Cathonnet, M.

doi:10.1016/s0082-0784(98)80424-4

Cited by 150 publications

(122 citation statements)

References 17 publications

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“…Species profiles were first measured by Dagaut et al [18] in a jet-stirred reactor (JSR) using fuel mixtures highly diluted in argon, for equivalence ratios from 0.2 to 1.0, at a pressure of 10 atm, and in the temperature range 550−1100 K. Subsequently, flow-reactor data were taken by Fischer et al [19] (1118 K, 3.5 atm, and 1085 K, 1 atm, φ = 0.32 − 3.40) and Curran et al [20] (550 − 850 K, 12 − 18 atm, φ = 0.7 − 4.2). These studies [19,20] also developed a detailed chemical kinetic mechanism to simulate their experimental data, using it to identify the important reaction pathways controlling DME fuel oxidation.…”

Section: Introductionmentioning

confidence: 99%

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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

396

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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Section: Introductionmentioning

confidence: 99%

“…These studies [19,20] also developed a detailed chemical kinetic mechanism to simulate their experimental data, using it to identify the important reaction pathways controlling DME fuel oxidation. This mechanism was also used to simulate JSR data [18] and shock-tube ignition delay times.…”

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

396

279

View full text Add to dashboard Cite

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“…As stated above, chainbranching in the DME oxidation system depends on the availability of the CH 2 OCH 2 OOH radical. This chain-branching precursor is expected to be relatively stable and has a long lifetime below 600 K [8,11,15]. During the experimental work by Liu et al [22], the reactions responsible for the low-temperature ignition were first detected at about 533 K with residence time of 3.9 s. It is suggested that the longer exposure time in our study may give a fairly long enough time for the CH 2 OCH 2 OOH radical accumulating and reacting with O 2 , and then undergo the decomposition reactions to release more than one reactive radical (mainly OH radicals) to realize a chain-branching.…”

Section: Potential Auto-ignition Mechanism At Low-temperaturementioning

confidence: 99%

“…A number of experimental [3][4][5][6][7][8][9][10][11][12][13] and theoretical [14][15][16][17] studies have been accomplished to elucidate the detailed processes of DME oxidation at low-temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed chemical models of DME oxidation at low-temperature were proposed by Dagaut et al [8] and Curran et al [10,11], which have been validated by the experimental results of jet-stirred reactors [8], flow reactors [11], shock tubes [18] and Two-stage Ignition of DME/air Mixture at Low-temperature (<500K) under Atmospheric Pressure 6 others [13,19,20]. These models have been developed based on the typical two-stage oxidation mechanisms for long-chain hydrocarbons [21].…”

Section: Introductionmentioning

confidence: 99%

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Two-stage ignition of DME/air mixture at low-temperature (<500 K) under atmospheric pressure

Gao

Nakamura

2013

Fuel

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Low-temperature ignition characteristics of dimethyl ether (DME)/air mixture were studied in an external heated, straight-shaped, plug-flow reactor under atmospheric pressure. Auto-ignition of the mixture was attained under a specific narrow range of temperature and equivalence ratio with relatively longer exposure time. Three kinds of ignition behaviors were identified accordingly as the equivalence ratio increased, such as (1) periodic hot flames, followed by (2) periodic two-stage ignitions (weak flame(s) and subsequent hot flame), lastly (3) chaotic weak flames. Time-sequential gas analyses were conducted for the case showing a typical periodic two-stage ignition in order to investigate the mechanism of the observed low-temperature auto-ignition under 500 K. The results revealed that the formation of CH 4 and C 2 H 2 was promoted prior to the hot flame ignition, suggesting that the chain-branching reaction pathway might exist.The transition from weak flame to hot flame was clearly observed as the mixture equivalence ratio decreased, implying the oxygen could be responsible to trigger this transition. It is suspected that the chain-branching precursor CH 2 OCH 2 OOH radicals should be relatively stable in the examined temperature range here, thus can gradually accumulate through a longer exposure time, and eventually give rise to the chainbranching explosion.* Corresponding author. Address: Hokkaido University, Kita13 Nishi8, Kita-ku, Sapporo 060-8628, Japan. Tel. & fax: +81-11-706-6386. E-mail address: yuji-mg@eng.hokudai.ac.jp Two-stage Ignition of DME/air Mixture at Low-temperature (<500K) under Atmospheric Pressure 2 Keywords: dimethyl ether, low-temperature oxidation, low-temperature auto-ignition, flames with repetitive extinction and ignition (FREI), two-stage ignition, cool flame.Two-stage Ignition of DME/air Mixture at Low-temperature (<500K) under Atmospheric Pressure 3 Highlights ► Auto-ignition of DME/air mixture was captured in a specific narrow range in temperature and equivalence ratio. ► Weak flame is transited to hot flame as equivalence ratio decreases.► CH 4 and C 2 H 2 formed due to the chain-branching reaction pathways.

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Shock tube studies on ignition delay and combustion characteristics of oxygenated fuels under high temperature

Wang

et al. 2020

Int J Energy Res

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Summary A comparative study on ignition delay time and combustion characteristics of four typical oxygenated fuel/air mixtures of dimethyl ether (DME), diethyl ether (DEE), ethanol and E92 ethanol gasoline was conducted through the chemical shock tube. The fuel/air mixtures were measured under the ignition temperature of 1100 to 1800 K, initial pressure of 0.3 MPa and the equivalence ratios of 0.5, 1.0 and 1.5. The experimental results show that the ignition delay time of these four oxygenated fuels satisfies the Arrhenius relation. The reaction H + O2 = OH + O has a high sensitivity in four fuel/air mixtures during high‐temperature ignition, which makes the ignition delay lengthen with the increase of the equivalence ratios. By comparing the ignition delay of four fuels, ether fuels have excellent ignition performance and ether functional group has better ignition promotion than hydroxyl group. Moreover, the carbon chain length also significantly promotes the ignition. Due to the accumulation of a large number of active intermediates and free radicals during the long ignition delay time before ignition, the four fuels all have intense deflagration and generate the highest combustion peak pressure at the relatively low ignition temperature (1150‐1300 K). For DME, DEE and ethanol, due to the high content of oxygen in their molecules, the combustion peak pressure and luminous intensity increased with the equivalence ratio, and the combustion is intense after ignition. E92 ethanol gasoline with low oxygen content has a lower combustion peak pressure and a longer combustion duration than the other three fuels, and its highest combustion peak pressure appears in the stoichiometric ratio. The combustion process of E92 ethanol gasoline is more oxygen‐dependent than the other three fuels.

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The oxidation and ignition of dimethylether from low to high temperature (500–1600 K): Experiments and kinetic modeling

Cited by 150 publications

References 17 publications

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

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

Two-stage ignition of DME/air mixture at low-temperature (<500 K) under atmospheric pressure

Shock tube studies on ignition delay and combustion characteristics of oxygenated fuels under high temperature

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