An experimental and modeling study of dimethyl ether/methanol blends autoignition at low temperature

Wang, Hong-Fu; Fang, Ruozhou; Weber, Bryan W.; Sung, Chih-Jen

doi:10.1016/j.combustflame.2018.09.012

Cited by 19 publications

(11 citation statements)

References 45 publications

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“…early injection. There are several studies on RCCI methanol-diesel combustion, e.g., [11][12][13][14][15][16][17][18][19] . For instance, Zou et al [17] used different LRFs -including methanol, ethanol, n-butanol and gasoline -and diesel fuel as the HRF in numerical investigations of RCCI.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on combustion mode characterization for locally stratified dual-fuel mixtures

Karimkashi

Kahila

Kaario

et al. 2020

Combustion and Flame

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a b s t r a c tCombustion modes in locally stratified dual-fuel (DF) mixtures are numerically investigated for methanol/n-dodecane blends under engine-relevant pressures. In the studied constant-volume numerical setup, methanol acts as a background low-reactivity fuel (LRF) while n-dodecane serves as high-reactivity fuel (HRF), controlling local ignition delay time. The spatial distribution of n-dodecane is modeled as a sinusoidal function parametrized by stratification amplitude ( Y ) and wavelength (0.01 mm <λ< 15 mm). In contrast, methanol is assumed to be fully premixed with air at equivalence ratio 0.8. First, onedimensional setup is investigated by hundreds of chemical kinetics simulations in ( Y , λ) parameter space. Further, the concepts by Sankaran et al. (2005, Proceedings of the Combustion Institute ) and Zeldovich (1980, Combustion and Flame ) on ignition front propagation speed are applied to develop a theoretical analysis of the time-dependent diffusion-reaction problem. The theoretical analysis predicts two combustion modes, (1) spontaneous ignition and (2) deflagrative propagation, and leads to an analytical expression for the border curve called β-curve herein. One-dimensional chemical kinetics simulations confirm the presence of two combustion modes in ( Y , λ) parameter space while the β-curve explains consistently the position of phase border observed in the simulations. Finally, the role of convective mixing is incorporated to the theoretical expression for the β-curve. The effect of convection on combustion modeis assessed by carrying out two-dimensional fully-resolved simulations with different turbulence levels. Two-dimensional numerical simulation results give evidence on combustion mode switching, which is consistent with predictions of the modified β-curve for turbulent cases. The practical output of the paper is the β-curve which is proposed as a predictive tool to estimate combustion modes for various fuels or fuel combinations.

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Section: Introductionmentioning

confidence: 99%

A numerical study on combustion mode characterization for locally stratified dual-fuel mixtures

Karimkashi

Kahila

Kaario

et al. 2020

Combustion and Flame

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“…Thus, methanol combustion has been widely studied over the past few decades. Global combustion properties including laminar flame speeds, ignition delay times, and species concentrations during methanol oxidation over a wide range of conditions have been measured by using relevant experimental facilities . Comprehensive chemical kinetic mechanisms for methanol combustion are also developed and validated against certain combustion conditions .…”

Section: Introductionmentioning

confidence: 99%

“…Comprehensive chemical kinetic mechanisms for methanol combustion are also developed and validated against certain combustion conditions . Additionally, methanol blended with other hydrocarbon fuels was also studied and can be found in a large number of references . The above studies continue to contribute to the development and optimization of the detailed chemical kinetic mechanism for methanol combustion.…”

Section: Introductionmentioning

confidence: 99%

Skeletal chemical kinetic mechanism generation for methanol combustion and systematic analysis on the ignition characteristics

Liang

Jia

Sun

et al. 2020

Asia-Pacific J Chem Eng

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A skeletal chemical kinetic mechanism for methanol combustion is developed based on a comprehensive detailed mechanism (AramcoMech 3.0), which consists of 581 species and 3,037 reactions. The systematic skeletal mechanism reduction methods are applied to the detailed mechanism to obtain a minimal skeletal mechanism. Systematic mechanism analysis including global reaction path and sensitivity analysis are performed to identify key reactions relevant to methanol oxidation. Species relevant to the combustion chemistry of methanol are analyzed through global reaction path and compared with other reduced mechanisms, which highlights the importance of maintaining realistic chemistry in skeletal mechanism. Brute-force sensitivity analysis and chemical explosive mode analysis are employed to analyze the ignition properties of methanol. The performance of the skeletal mechanism is validated against a wide range of pressures, temperatures, and equivalence ratios for ignition, species concentrations, and laminar flame speeds. This work not only presents a minimal skeletal mechanism for methanol combustion based on systematic mechanism reduction methods from very large detailed mechanisms but also provides insight into the chemical kinetics of methanol combustion. K E Y W O R D Scombustion kinetics, ignition, methanol, skeletal mechanism

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“…While the autoignition behavior of DME has been described in detail [34][35][36][37][38][39] and DME chemical mechanisms have been developed therein, the use of DME as a fuel also requires the experimental verification of the predictions of other flame properties as well. Premixed laminar flame studies play an important role in testing chemical mechanisms since they provide data, such as burning velocities and species profiles for this purpose.…”

Section: Chapter -3 -mentioning

confidence: 99%

“…While the use of the specific volume from the non-reactive pressure trace in this case can result in computed overall ignition delay times that tend to be too short, the magnitude of the resulting discrepancy has been estimated to be less than 30% [109]. As done in other systems showing preignition heat release (for example, [34,35,38,39,109], the same approach is -77 -used here, while cognizant of its shortcomings. For the kinetic analysis, simulations at constant specific volume were performed to avoid the complications in interpretation caused by post-compression heat loss.…”

Section: Experimental Conditions and Mechanism Detailsmentioning

confidence: 99%

Experimental and numerical studies of the ignition of ammonia/additive mixtures and dimethyl ether burning velocities

Dai¹

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An experimental and modeling study of dimethyl ether/methanol blends autoignition at low temperature

Cited by 19 publications

References 45 publications

A numerical study on combustion mode characterization for locally stratified dual-fuel mixtures

A numerical study on combustion mode characterization for locally stratified dual-fuel mixtures

Skeletal chemical kinetic mechanism generation for methanol combustion and systematic analysis on the ignition characteristics

Experimental and numerical studies of the ignition of ammonia/additive mixtures and dimethyl ether burning velocities

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