A Study on the Reduction of Reaction Mechanism for the Ignition of Dimethyl Ether

Ryu, Bong Woo; Park, Sungwook; Lee, Chang Sik

doi:10.3795/ksme-b.2011.35.1.075

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Peak concentration analysis. The peak concentration analysis 20,21 is to identify the maximum mole fraction of all species that can be obtained through the 0-D constant volume combustion analysis and to remove the species having the maximum mole fraction below the userdefined threshold value. However, unlike the DRGbased methods, the species is determined to be removed by the maximum mole fraction.…”

Section: Procedures Of Mechanism Reductionmentioning

confidence: 99%

A study on the mechanism reduction and evaluation of biodiesel with the change of mechanism reduction factors

Jung

Lim

Suh

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study aims to confirm the effect of changing the various factors with the directed relation graph error propagation–based methods and to adopt a new approach of the mechanism evaluation in the reduction of biodiesel mechanism. The factors considered in this study were a threshold value, target species, ambient conditions, and the evaluation formula consists of the reduction rates and the maximum error rate of ignition delay to objectively compare the skeletal mechanisms generated under different conditions. For a threshold value, the automatic mechanism reduction process was used to select the appropriate threshold value by applying the relative tolerance and absolute tolerance; so relative tolerance and absolute tolerance represent the factor of the threshold value. Also, the seven steps of mechanism reduction process consist of directed relation graph error propagation, directed relation graph error propagation with sensitivity analysis, peak concentration analysis, full species sensitivity analysis, and A-factor modification. As a result of the mechanism reduction, different relative tolerance and absolute tolerance values should be applied to each step to select the appropriate threshold value. For target species, considering polycyclic aromatic hydrocarbon species as target species shows higher efficiency of mechanism reduction. Also, considering the negative temperature coefficient region as ambient conditions helps the mechanism be reduced efficiently than a wide range of ambient conditions. Finally, the reduced mechanism which had 247 species and 1129 reactions was generated, and the maximum error rate of ignition delay was about 30%. For the applicability of three-dimensional computational fluid dynamics and verification of the reduced mechanism, the compression ignition engine simulation was performed. As a result of three-dimensional computational fluid dynamics, the predicted cylinder pressure, rate of heat release, indicated mean effective pressure, and power were similar to the experimental results. However, the results of carbon monoxide and nitrogen oxide emissions did not match the experimental results.

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Section: Procedures Of Mechanism Reductionmentioning

confidence: 99%

A study on the mechanism reduction and evaluation of biodiesel with the change of mechanism reduction factors

Jung

Lim

Suh

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Yamada et al 36 developed a reduced mechanism consisting of 23 species and 23 reactions by extracting essential elementary reactions from the detailed mechanism of DME. Chin et al 37 constructed a 28-species reduced mechanism for DME combustion using the QSSA method based on the detailed mechanism given by Zhao et al 38 Ryu et al 39 deduced a 44-species and 166-reaction reduced mechanism for DME from a detailed 79-species and 351-reaction mechanism using sensitivity analysis.…”

Section: Introductionmentioning

confidence: 99%

A criterion based on computational singular perturbation for the construction of reduced mechanism for dimethyl ether oxidation

Qiao

Huang

2013

JSCS

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A criterion based on the computational singular perturbation (CSP) method is proposed in order to determine the number of quasi-steady state (QSS) species. This criterion is employed for the reduction of a detailed chemical kinetics mechanism for the oxidation of dimethyl ether (DME), involving 55 species and 290 reactions, leading to a 20 steps reduced mechanism which involves 26 species. A software package, named I-CSP, was developed to make the reduction process algorithmic. Input to the I-CSP includes (i) the detailed mechanism, (ii) the numerical solution of the problem for a specific set of operating conditions, (iii) the number of quasi steady state (QSS) species. The resulting reduced mechanism was validated both in homogenous reactor, including auto-ignition and PSR, over a wide range of pressures and equivalence ratios, and in a one-dimensional, unstretched, premixed, laminar steady DME/Air flame. Comparison of the results calculated with the detailed and the reduced mechanisms shows excellent agreement in the case of homogenous reactor, but discrepancies can be observed in the case of the premixed laminar flame

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A Study on the Reduction of Reaction Mechanism for the Ignition of Dimethyl Ether

Cited by 2 publications

References 11 publications

A study on the mechanism reduction and evaluation of biodiesel with the change of mechanism reduction factors

A study on the mechanism reduction and evaluation of biodiesel with the change of mechanism reduction factors

A criterion based on computational singular perturbation for the construction of reduced mechanism for dimethyl ether oxidation

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