Laminar burning velocity and flame structure of DME/methane + air mixtures at elevated temperatures

Experimental Investigation of Lean Methane–Air Laminar Premixed Flames at Engine-Relevant Temperatures

“…The measurements of laminar flame speeds were performed at ambient pressure in the temperature range of 350–800 K. The present experimental data can be seen in Table in Appendix A. Figure shows the comparison of the present experimental data with existing S L data ,,,− at elevated preheating temperatures. The results indicate that GRI-Mech 3.0 overestimates the S L while FFCM-1 shows a good agreement with existing data at T u ≤ 550 K. The USC Mech II mechanism shows a good agreement with present experimental measurements at stoichiometric conditions when the inlet temperature elevates but still slightly overestimates the flame speed at lean conditions as previously mentioned.…”

“… To validate the present measurement system, the methane–air flame speed at 300 and 373 K were measured and compared with existing literature, − ,,,,− ,− as shown in Figure . Each data point was obtained by averaging the results of 24 schlieren images, and the error bars represent the scale of one standard deviation.…”

“…Correlations between S L and equivalence ratio were empirically given as an exponential function within the range of ϕ = 0.8−1.2. Hu et al 12 measured S L of methane− air mixtures up to 443 K. Ogami and Kobayashi 13 measured S L of stoichiometric methane−air mixtures diluted by helium up to 600 K. More recently, S L of methane−air mixtures has been measured at 300−573 K by Mohammad et al, 14 489−573 K by Ferris et al, 15 and 300−650 K by Varghese et al 16 Egolfopoulos and co-workers 17 measured S L for C1−C4 hydrocarbons at 400−520 K and 0.8−3.0 MPa. Along with theoretical and numerical studies, it is unequivocal that the flame propagation speed and its gradient to temperature increase with the preheating temperature.…”

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

“…The basic combustion characteristics of pure DME and DME blends have been studied by numerous scholars, , such as Hashemi et al who used a flow reactor to study the pyrolysis and oxidation processes of DME and DME/CH 4 . Mohammad and Juhany performed experimental measurements and PREMIX code predictions of laminar combustion velocities of DME/CH 4 and air mixtures.…”

“…The basic combustion characteristics of pure DME and DME blends have been studied by numerous scholars, , such as Hashemi et al who used a flow reactor to study the pyrolysis and oxidation processes of DME and DME/CH 4 . Mohammad and Juhany performed experimental measurements and PREMIX code predictions of laminar combustion velocities of DME/CH 4 and air mixtures. Detailed analysis of DME addition to boost the overall reaction activity and combustion rate was carried out with the assistance of the heat release rate, species profiles, and reaction pathway sensitivity.…”