Experimental Investigation and Numerical Analysis on the Flames of Non-Premixed Methane and Air in a Micro Swiss-roll Combustor
Experimental and numerical study was performed to investigate non-premixed methane/air flames in a micro Swiss-roll combustor.Six flame patterns were observed in the experiment,namely,single flame,relatively symmetrical twin flames,pulsating flame,obviously asymmetric twin flames,extinction and blowout.The lower limits of nominal equivalence ratio(φ)and methane flow rate(FM)required to sustain combustion were found to be 0.4 and 0.02 L·min-1,respectively.Flame structures were well reproduced through numerical simulation,and the vertical asymmetry of the flame structure was revealed as well.The comparison between the numerical results obtained by considering the gravity or not,demonstrated that the buoyancy effect played an important role in the flow field and flame structure.In summary,the present study provides a deeper insight into non-premixed flame characteristics in micro Swiss-roll combustors.
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