Analytical and experimental study of premixed methane-air flame propagation in narrow channels

Chao, C. Y. H., Hui, K. S. ORCID:, Kong, W., Cheng, P. and Wang, J. H. (2007) Analytical and experimental study of premixed methane-air flame propagation in narrow channels. International Journal of Heat and Mass Transfer, 50 (7-8). pp. 1302-1313. ISSN 0017-9310

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This study investigates analytically and experimentally the influence of preheat temperature on flame propagation and extinction of premixed methane-air flame in single quartz tubes with inner tube diameters of 3.9, 3, 2 and 1 mm respectively. The effects of preheat temperature, tube diameter, equivalence ratio and mixture flow rate on the flame speed and extinction conditions are determined. The analytical results show that high preheat temperature of the mixture can effectively suppress flame quenching, and the occurrence of stable solution in the slow flame branch extends the flammability limit leading to possible flame propagation in mini channels. Experimental results confirm that the flame speed increases and the flammability limit shifts toward the fuel lean direction either through increasing the preheat temperature or decreasing the mixture flow rate, or both. Decrease of propagating flame speed is observed before the stoichiometric equivalence ratio at high preheat temperatures. The analytical model provides insights into how propagating flame in mini channels can be sustained; however, the model is only good at predicting flame speed near the fuel lean branch. Influence of Cu2+ ions exchanged zeolite 13X catalyst on flame speed is also addressed. It is noted that the zeolite based catalyst can lower the preheat temperature requirement in order to sustain the flame propagation in narrow channels.

Item Type: Article
Uncontrolled Keywords: activation energy,asymptotic analysis,flame speed,flammability limits,narrow channels
Faculty \ School: Faculty of Science > School of Engineering
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Energy Materials Laboratory
Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV)
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Depositing User: Pure Connector
Date Deposited: 04 Oct 2016 12:01
Last Modified: 20 Apr 2023 00:16
DOI: 10.1016/j.ijheatmasstransfer.2006.09.012

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