Journal
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
Volume 143, Issue 5, Pages -Publisher
ASME
DOI: 10.1115/1.4049462
Keywords
counterflow flame; numerical modeling; premixed methane-air mixture; unsteady solution; quasi-steady equilibrium; air emissions from fossil fuel combustion; fuel combustion
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This study conducted an unsteady analysis of methane/air premixed counterflow flame under different flame conditions and stability parameters, yielding insights into factors affecting flame stability and structure such as hydraulic distance of microchannel, time-dependent characteristics, and the impact of time variations. The results presented show the importance of considering time-dependent analysis to understand flame behavior before reaching a steady-state condition.
In the current work, an unsteady analysis of methane/air premixed counterflow flame is carried out for different flame conditions and stability parameters considering different strain rate values. The results are presented at unsteady and final steady conditions, and the impact of time-dependent regimes and variations in equivalence ratio, from lean flame to rich one, are analyzed. The governing equations including continuity, momentum, energy, and species are numerically solved with a coupled simple and Piso algorithm. It is also found that when the strain rate value is 1000 s(-1), for flame stability, the hydraulic distance of the microchannel must be at least 0.05 mm. Increasing the strain rate results in decreasing the time of stabilizing temperature distribution with a faster quasi-steady equilibrium. The necessity of time-dependent analysis is to comprehend the variations in the main factors of flame structure before reaching the finalized steady-state condition. Therefore, by designing an intermittent automatic valve, if the flow stops in time period of 0.0025 s and starts again, the formation of NO2 and CO2 will be reduced about 50% and 9%, respectively, in a case with a = 100 s(-1).
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