Laminar premixed methane/air flame extinction characteristics influenced by co-flow water mists

Based on the tubular burner, the burning velocities, flame stretch and inhibition rules influenced by co-flow water mists were studied using a high-speed schlieren system. Moreover, the variation rules of the flame critical extinction in our burner equipment were also obtained by analyzing the proce...

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Bibliographic Details
Published in:Chinese science bulletin 2008-02, Vol.53 (3), p.450-459
Main Authors: Liu, XuanYa, Lu, ShouXiang, Zhu, YingChun, Liu, Yi
Format: Article
Language:English
Subjects:
Chemistry/Food Science
Earth Sciences
Engineering
Humanities and Social Sciences
Life Sciences
multidisciplinary
Physics
Science
Science (multidisciplinary)
灭火特征
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Summary:Based on the tubular burner, the burning velocities, flame stretch and inhibition rules influenced by co-flow water mists were studied using a high-speed schlieren system. Moreover, the variation rules of the flame critical extinction in our burner equipment were also obtained by analyzing the process and mechanism of flame extinction and inhibition. It is shown that the flame stretch is related to the fuel concentration, co-flow fluxes and water mist diameters. For droplets with a larger diameter, the smaller the co-flow fluxes, the more obvious the flame stretch. When the water mist loading rate is rather smaller, for fuel-rich premixed flame with Le〉1, the flame with larger burning rate tends to backfire more easily. Under the same water mist conditions, for fuel-lean premixed flame with Le〈1, the smaller the gas concentration, the easier the flame is extinct.
ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-008-0013-2