Studies of radiation absorption on flame speed and flammability limit of CO2 diluted methane flames at elevated pressures

The effects of spectral radiation absorption on the flame speed at normal and elevated pressures were experimentally and numerically investigated using the CO2 diluted outwardly propagating CH4–O2–He flames. Experimentally, the laminar burning velocities of CH4–O2–He–CO2 mixtures at both normal and elevated pressures (up to 5 atm) were measured by using a pressure-release type spherical bomb. The results showed that radiation absorption with CO2...