Dependence of methane laminar flame propagation speed on the pressure and initial temperature

Abstract

The paper presents the results that allowed obtaining the dependence of laminar flame propagation speed Sl on the equivalence ratio for a wide range of pressures and temperatures during methane combustion. A literature review was carried out to summarize the experimental data on the measurement of the Sl. The Sl was calculated using a kinetic mechanism GRI 3.0 within the required pressure and temperature range. The calculation results were generalized in the MATLAB software product to verify the Sl power dependencies on pressure and initial temperature. The results of calculation on the basis of the obtained approximating dependence were compared with the experimental data and results obtained by other authors. It was found that the exponents of power for the dependency on pressure and temperature are described not by constants or linear relations, but by second-degree equations on the fuel-air ratio. The results can be used in three-dimensional simulation of combustion processes and in calculations performed using engineering practices.

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“…The last step of this study was to examine the precision of the empirical formula presented in the form of an Equation ( 26), together with the often-used formula (Lukachev formula [50]) for computing the dependences of the laminar flame speed propagation on the pressure and initial temperature during the combustion of methane. A brief review of the Lukachev formula is described below.…”

“…[50], the laminar flame speed (S l ) values were obtained experimentally [51-56] and calculated using the original formulas and using the detailed kinetic mechanism for methane/air combustion (GRI-Mech 3.0 detailed mechanism) [57]. Lukachev et al (2016) [50] concluded that the results of the calculation of S l according to the optimized mechanism designed to model natural gas combustion (GRI-Mech 3.0) agree well with the experimental data and can be used to refine the calculations of the dependence of the components S l = f (ϕ, T k , p k ) (see Table 9). Table 9.…”

“…An accuracy of the newly derived Woschni correlation (Equation ( 26)) was compared with the results obtained using the original formula proposed by Lukachev et al (2016) [50] (see Table 10).…”