Comparisons of the Uncoupled Effects of CO2 on the CH4/O2 Counterflow Diffusion Flame under High Pressure

A comprehensive numerical investigation of the uncoupled chemical, thermal, and transport effects CO2 on temperature CH4/O2 counterflow diffusion flame under high pressure up to 5 atm was conducted. Three pairs artificial species were introduced distinguish chemical effect, thermal effect temperature. The results showed that both dilution in oxidizer side can decrease significantly, while only slightly increase even be ignored. reduction value caused by grows linearly, increases exponentially. RPchem RPthermal are defined explain percentage due total dilution, respectively. decreases with pressure, strain rate, ratio, behaves opposite manner. In above conditions, plays a dominant role reduction.