Propagation characteristics of premixed methane-air flames

CHEN Dong-liang; SUN Jin-hua; LIU Yi; MA Ye-feng; HAN Xue-bin

doi:10.11883/1001-1455(2008)05-0385-06

Volume 28 Issue 5

Sep. 2014

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Article Navigation > Explosion And Shock Waves > 2008 > 28(5): 385-390

ZHANG Zu-gen, LI Ying-lei, LI Ying-hua, CHEN Xi-meng. Influences of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments[J]. Explosion And Shock Waves, 2009, 29(6): 573-578. doi: 10.11883/1001-1455(2009)06-0573-06

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CHEN Dong-liang, SUN Jin-hua, LIU Yi, MA Ye-feng, HAN Xue-bin. Propagation characteristics of premixed methane-air flames[J]. Explosion And Shock Waves, 2008, 28(5): 385-390. doi: 10.11883/1001-1455(2008)05-0385-06

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Propagation characteristics of premixed methane-air flames

doi: 10.11883/1001-1455(2008)05-0385-06

1.
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2.
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, China;
3.
College of Chemistry and Chemical Engineering, China University of Petroleum, Dongying 257061, Shandong, China

Publish Date: 2008-09-25

Abstract

Abstract

The techniques of the high-speed schlieren photography, etc. were used to investigate the characteristics of the premixed methane-air flames with different equivalence ratios propagating through a closed tube. Based on the experimental results, the combustion behaviors and characteristics of the premixed flames were analyzed. Analyzed results show as follows: (1) the transformation process of the flame front bending to the unburned zone turning into bending to the burned zone during the flame propagation happens while the equivalence ratio volume approaches to 1, thus the typical tulip flame structure forms during the transformation; (2) the transformation process of the flame front does not happen while the equivalence ratio volume deviates from 1 to a certain extent, and the premixed flame shows the typical laminar combustion. (3) the tulip-flame structure forms in the period of the flame propagation velocity decreasing greatly and it can form only while the maximum deceleration is larger than a certain quantity; (4) the tulip-flame structure is a middle stage during the transformation of the premixed flame from the laminar combustion to the turbulent combustion.
- mechanics of explosion,
- turbulent combustion,
- high-speed schlieren photography,
- premixed methane-air flame,
- tulip flame

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