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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

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