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This study explored the typical features of flame from syngas/air premixed flame in a narrow gap disk burner based on diluted N 2  and CO 2 . Four concentrations (i.e. 10%, 20%, 30%, and 40%) of CO 2  and five concentrations (i.e. 10%, 20%, 30%, 40%, and 50%) of N 2  were adopted in this study. The experiment was conducted in a narrow gap disk burner with a clearance of 2 mm. The results showed that the addition of N 2  and CO 2  significantly reduced the brightness of flame, the flame propagation velocity, and the pressure resulting from the explosion. When the CO 2  concentration reached 40%, the maximum pressure was reduced to 60.78 kPa, which was 41.5% lower than that without diluent. When the N 2  concentration was increased to 50%, the maximum pressure was reduced to 67.01 kPa, but at this point, the inhibition effect on the maximum pressure was not as good as 40% of CO 2 . Additionally, the dilution effect of CO 2  was more obvious than of N 2 . An analysis on the dilution mechanism found that reduced moles of critical radicals H, O, and OH were an important reason for the inhibition effect. However, with the increase of N 2  and CO 2  concentrations, the unstable flame propagation behavior in a later stage was not inhibited, but enhanced. The unstable propagation behavior was related to the flow field disturbance caused by heat loss.

Effect of N 2 and CO 2 dilution on syngas/air deflagration characteristics in narrow gap disk burner