A Criterion Based on Computational Singular Perturbation for the Construction of Reduced Mechanism for Dimethyl Ether

Abstract

Abstract: A criterion based on computational singular perturbation (CSP) was proposed to determine the number of quasi-steady state (QSS) species. Together with CSP, it was applied to the reduction of dimethyl ether (DME) involving 55 species and 290 reactions leading to the development of a 26-species reduced mechanism with 20 lumped steps. A software package named I-CSP was developed to make the reduction process more efficient. 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 pressure and equivalence ratio, and in a steady, one-dimensional, burner-stabilized freely propagating premixed laminar flame. Comparison of the results calculated with the detailed and the reduced mechanisms shows excellent agreements in homogenous reactor, but discrepancies can be observed in the premixed laminar flame.

Key words: mechanism reduction, computational singular perturbation (CSP), selfdefined criterion, dimethyl ether

CLC Number:

TK 46

WU Zuo-Zhu, QIAO Xin-Qi, HUANG Zhen. A Criterion Based on Computational Singular Perturbation for the Construction of Reduced Mechanism for Dimethyl Ether[J]. Journal of Shanghai Jiaotong University, 2013, 47(03): 376-380.

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