Characterization of the effects of hydrogen addition in premixed methane/air flames

Large-eddy simulation of lean hydrogen–methane turbulent premixed flames in the methane-dominated regime

“…The Bunsen-type flames of interest correspond to lean premixed turbulent conditions at an equivalence ratio of 4 ¼ 0.6 and atmospheric pressure [22]. For the enriched flame, H 2 represents 20% of the blended fuel on a molar basis ð8 ¼ 0:2Þ.…”

“…To compare the numerical results with the experimental data of Halter et al [22], a time-average of the LES solutions was performed over 70 ms (from 30 ms to 100 ms) using 71 instantaneous snapshots of each solution. Moreover, 2D slices of the resolved LES temperature field were extracted and processed to calculate progress variable fields based on temperature.…”

“…Moreover, 2D slices of the resolved LES temperature field were extracted and processed to calculate progress variable fields based on temperature. The experimental flame brush was calculated using 500 Mie scattering images of oil droplets seeded in the fresh mixture of reactants [22]. The images were converted to a binary format and an edge-finding algorithm was applied to each instantaneous image to determine the progress variable maps.…”

“…The LES and PCM-FPI modelling procedures are then applied to the prediction of laboratory-scale axisymmetric Bunsen-type turbulent premixed flames. Both premixed methaneeair and H 2 -enriched methaneeair flames are considered and the predicted solutions are examined and compared to measured data from the experimental study of Halter et al [22]. The enriched flame has 20% H 2 by volume and lies in the methane-dominated regime as defined by Di Sarli and Di Benedetto [15].…”

“…The predicted solutions for both flames are examined and further compared to available data from the experiments carried out earlier by Halter et al [22].…”