A comprehensive kinetic model for dimethyl ether and dimethoxymethane oxidation and NO  interaction utilizing experimental laminar flame speed measurements at elevated pressure and temperature

Shrestha, Krishna Prasad; Eckart, Sven; Elbaz, Ayman M.; Giri, Binod Raj; Fritsche, Chris; Seidel, Lars; Roberts, William L.; Krause, Hartmut; Mauß, Fabian

doi:10.1016/j.combustflame.2020.04.016

Cited by 86 publications

(70 citation statements)

References 83 publications

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“…Beyond the existing measurements of Shrestha et al, 46 higher pressures and engine‐relevant temperatures should be further investigated. This would open up routes to controllable practical applications in the future alongside theoretical studies.…”

Section: Discussionmentioning

confidence: 95%

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations

et al. 2020

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Summary Premixed flames play a prominent role in combustion systems such as aircraft combustors, gas turbines and internal combustion engines. Current fuels are also derived from fossil sources, including coal, petrol, gasoline, natural gas or liquefied petroleum gas. Alternatively, liquid and gaseous biofuels, such as ethanol and biodiesel, hydrogen, wood gas or coal gas, can be used with appropriate modifications. Furthermore, the components of oxygenated fuel are known for their reduction of soot particles in diesel combustion processes while having little effect on nitrogen oxide (NOX) emissions. The advantage of C1‐oxygenate dimethoxymethane (OME1, also called “methylal” or DMM) is the lack of CC bonds in their molecular structure. OME1 belongs to the group of oxymethylene ethers (OMEn) with the molecular structure CH3O(CH2O)nCH3 where n = 1 (short molecular structure: C3H8O2). This experimental and numerical study aims to investigate the laminar burning velocity (LBV) of the oxymethylene ether (OMEn, n = 1), the influence of temperature and nitrogen dilution. To our knowledge, no studies have been conducted with regards to nitrogen dilution during the measurements of OME1 burning velocity. In this study, a heat‐flux burner setup was used to investigate the LBV for equivalence ratios from 0.7 to 1.6. The experimental LBV data shows a decreasing nonlinear influence of nitrogen dilution effects for 0% to 70% and increasing linear with preheating up to 373 K. The numerical results were compared with the experiments conducted with simple alcohols (ethanol) and C3 hydrocarbon fuels (propane). Existing numerical reaction mechanisms can only partially reproduce the new experimental data. Finally, a sensitivity analysis was conducted by changing various parameters during the numerical investigations, in order to clarify the discrepancy.

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Section: Discussionmentioning

confidence: 95%

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations

et al. 2020

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“…We discuss the role of these phenomena in the effect of (a) (b) DME on ammonia ignition in Section 3.5.1 , below. We report in passing that simulations using the mechanism from Shrestha et al [54] did not exhibit two-stage ignition in experiments in which it was observed and for some experimental conditions failed to show any ignition. Consequently, we do not consider this mechanism further, but include the results in the Supplementary Material.…”

Section: Characteristics Of the Ignition Profilementioning

confidence: 72%

“…In the period leading to first-stage ignition, a minor fraction of the ammonia is oxidized to NO x and reactions of DME with nitrogen oxides maybe important for the multi-stage behavior observed. DME/NO x interactions were studied in detail recently by Shrestha et al [54] . A comprehensive kinetic model was presented for dimethyl ether and dimethoxymethane oxidation, including NO x interaction, utilizing experimental laminar flame speed measurements at elevated pressure and temperature.…”

Section: Numerical Approach 221 Chemical Kinetic Modelmentioning

confidence: 99%

Ignition delay times of NH3 /DME blends at high pressure and low DME fraction: RCM experiments and simulations

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Glarborg

et al. 2021

Combustion and Flame

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“…As can be seen, the experimental data from present work is in excellent agreement with that of Gillespie et al [57] indicating the reliability of the current work (see ref. [58] for further illustration of our laminar flame speed for neat DMM data at elevated temperatures and pressures).…”

Section: Laminar Burning Velocity Prediction From Chemical Kinetic Simulationsmentioning

confidence: 99%

Experimental and Kinetic Modeling Study of Laminar Flame Speed of Dimethoxymethane and Ammonia Blends

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Ammonia (NH 3 ) is considered a promising carbon-neutral fuel, with high hydrogen content, that can diversify the global energy system. Blending ammonia with a highly reactive fuel is one possible strategy to enhance its combustion characteristics. Here, an investigation of blends of NH 3 and dimethoxymethane (DMM), a biofuel with high fuel-born oxygen content and no carboncarbon bonds, is rep`orted. Unstretched laminar burning velocity (S L ) and Markstein length of different NH 3 /DMM blends were experimentally determined using spherically propagating premixed flames. The DMM mole fraction was varied from 0.2 to 0.6 while measuring S L at 298 K, 0.1 MPa and equivalence ratios () over a range of 0.8 to 1.3. The addition of DMM was found to immensely enhance the combustion characteristics of ammonia. DMM 20% (by mole fraction) in NH 3 /DMM blend increased S L more than a factor of 3 over neat ammonia; such enhancement was found to be comparable with 60% CH 4 in NH 3 ( = 0.9 -1.1) blends. Increasing  was found to significantly decrease the burned gas Markestein length for lean cases, whereas a negligible effect was observed for rich mixtures. A composite chemical kinetic model of DMM/NH 3 , aimed

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A comprehensive kinetic model for dimethyl ether and dimethoxymethane oxidation and NO interaction utilizing experimental laminar flame speed measurements at elevated pressure and temperature

Cited by 86 publications

References 83 publications

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations

Ignition delay times of NH3 /DME blends at high pressure and low DME fraction: RCM experiments and simulations

Experimental and Kinetic Modeling Study of Laminar Flame Speed of Dimethoxymethane and Ammonia Blends

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A comprehensive kinetic model for dimethyl ether and dimethoxymethane oxidation and NO interaction utilizing experimental laminar flame speed measurements at elevated pressure and temperature

Cited by 86 publications

References 83 publications

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME 1 ) using the heat‐flux burner method: Numerical and experimental investigations

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME 1 ) using the heat‐flux burner method: Numerical and experimental investigations

Ignition delay times of NH3 /DME blends at high pressure and low DME fraction: RCM experiments and simulations

Experimental and Kinetic Modeling Study of Laminar Flame Speed of Dimethoxymethane and Ammonia Blends

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Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations

Determining the laminar burning velocity of nitrogen diluted dimethoxymethane ( OME ₁ ) using the heat‐flux burner method: Numerical and experimental investigations