The adiabatic flame temperature and laminar flame speed of methane premixed flames at varying pressures

Abstract

This paper studies the influence of equivalence ratio, pressure and initial temperature on adiabatic flame temperature and laminar flame speed of methane-air mixture. The results indicate that adiabatic flame temperature is weakly correlated with pressure. The adiabatic flame temperature increases only by about 50ºC as a result of 30 bar pressure increase. The flame speed is inversely proportional to pressure. The maximum adiabatic flame temperature and flame speed occur at the stoichiometric ratio, Φ=1. The percent increase in the flame speed was about 400% when the initial temperature of the mixture is increased from 25ºC to 425ºC.

Keywords

• laminar flame speed
• high pressure
• equivalence ratio
• initial temperature