Markstein numbers in counterflow, methane- and propane- air flames: a computational study

摘要: The concept of Markstein numbers with respect to unburned and burned gases is first reviewed. We next present numerical simulations methane-air propane-air flames in the counterflow configuration using a detailed chemical kinetic model consisting 469 reactions 71 species. these flames, as function equivalence ratio, are computed both gases. It shown that values number relative not equal may even have opposite signs, supported by asymptotic theory. from then compared published literature for same mixtures. show experimental literature, obtained expansion rates spherical very close our gases, simply re-normalized gas density ratio. These results support idea respond similarly small characteristic stretch. also find agreement an measurement made on propane flame. However, some evaluated significantly different those indirectly measurements growth rate unstable structures planar flames. evidence suggest flame theory, used obtain indirect numbers, quantitatively applicable when effective Lewis mixture unity.