Methane Pyrolysis: literature survey and comparisons of available data for use in numerical simulations
Résumé
tMethane pyrolysis has been investigated in the open literature for a number of applications (improvementof fuel cracking, production of hydrogen, aeronautics and space use for cooling). This implies a large panelof experimental conditions and the development of numerous kinetic schemes, all validated for differenttest ranges. During the past decade, a renewal of interest has emerged related to the possibility of usingmethane as a jet fuel for hypersonic applications. Within this context, the ability of the existing kineticschemes to reproduce the chemical behaviour of the fuel during its pyrolysis (T > 1500 K and P > 1 MPa)needs to be determined in order to for these mechanisms to be used in Computational Fluid Dynamicssimulations. Thus, a balance must be found between the accuracy of the predictions and the computationtime (linked to the mechanism size). This work proposes to review a large panel of the experimental andnumerical works and then compare the existing schemes with available data to estimate their potential(considering, if possible, the maximal stressing conditions). After a first selection, ten mechanisms arequantitatively compared with regard to three important species: methane, which reflects the pyrolysisrate; hydrogen, linked to propulsion efficiency, and acetylene which is involved in the formation of coke(unwanted effect). The computation time has also been determined and it serves as an additional selectioncriterion. One model seems to emerge in view of its accuracy and its size. This results in predictions withdisagreement under 40% compared to the reference data and a calculation time of less than 1 s for asimulated time of 10 s in the 0-D configuration.
Domaines
Chimie analytique
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