A Detailed Numerical Study of NOx Kinetics in Counterflow Methane Diffusion Flames: Effects of Fuel-Side versus Oxidizer-Side Dilution

Table 1

Conditions of diluted methane/air counterflow diffusion flames with and without H₂O or CO₂ replacement of N₂, 400 K, 1 atm.

No.	Fuel stream composition (vol%)				Oxidizer stream composition (vol%)				Remark
	CH4	N2	H2O	CO2	O2	N2	H2O	CO2
Case 1	50	50	0	0	21	79	0	0	Baseline H2O dilution (fuel-side)
Case 2	50	40	10	0	21	79	0	0
Case 3	50	30	20	0	21	79	0	0
Case 4	50	10	40	0c	21	79	0	0
Case 5	50	40	0	10	21	79	0	0	CO2 dilution (fuel-side)
Case 6	50	30	0	20	21	79	0	0
Case 7	50	10	0	40	21	79	0	0
Case 8	50	50	0	0	21	69	10	0	H2O dilution (air-side)
Case 9	50	50	0	0	21	59	20	0
Case 10	50	50	0	0	21	39	40	0
Case 11	50	50	0	0	21	69	0	10	CO2 dilution (air-side)
Case 12	50	50	0	0	21	59	0	20
Case 13	50	50	0	0	21	39	0	40