Numerical study of laminar premixed methane/air flames with carbon dioxide dilution

MIGUEL MENDIETA; DARIO ALVISO; ROGERIO GONCALVES DOS SANTOS

Vitória, ES

Congreso; 16 th Brazilian Congress of Thermal Sciences and Engineering; 2016

ABCM

In this work carbon dioxide dilution on the laminar premixed methane/air flames was studied by means of kinetic modelling. This study contributes to the understandings of the effect of CO2 concentrations on the combustion characteristics of biogas. The simulations were performed using the REGATH package with GRI 3.0 chemical scheme. Dilution from 0% to 50% CO 2 (volume) were computed at atmospheric pressure of 0.1 MPa an inlet temperature of 298 K with equivalence ratios from 0.7 to 1.3. Laminar flame speeds were estimated using a one-dimensional premixed flame model. The laminar flame speed and flame temperature of CH4/air decreased with increasing CO2 dilution. The increase in CO2 concentrations reduced the reactants concentrations, decreasing the net reaction rate and thus the flame speed.