LES approach to premixed methane/air flame propagating in the closed duct with a square-hole obstacle

Chen Peng; Li Yanchao; Huang Fujun; Zhang Yutao

doi:10.11883/1001-1455(2017)01-0021-06

Volume 37 Issue 1

Jan. 2017

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Chen Peng, Li Yanchao, Huang Fujun, Zhang Yutao. LES approach to premixed methane/air flame propagating in the closed duct with a square-hole obstacle[J]. Explosion And Shock Waves, 2017, 37(1): 1-9. doi: 10.11883/1001-1455(2017)01-0021-06

Citation:

Chen Peng, Li Yanchao, Huang Fujun, Zhang Yutao. LES approach to premixed methane/air flame propagating in the closed duct with a square-hole obstacle[J]. Explosion And Shock Waves, 2017, 37(1): 1-9. doi: 10.11883/1001-1455(2017)01-0021-06

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LES approach to premixed methane/air flame propagating in the closed duct with a square-hole obstacle

doi: 10.11883/1001-1455(2017)01-0021-06

1.
State Key Laboratory of Coal Resources and Safety Mining, China University of Mining & Technology, Beijing 100083, China
2.
School of Resource and Safety Engineering, China University of Mining & Technology, Beijing 100083, China

Received Date: 2015-05-20
Rev Recd Date: 2015-08-25
Publish Date: 2017-01-25

Abstract

Abstract

Aiming at revealing the characteristics of premixed methane/air flame propagating in an obstructed duct.A 4 mm thick obstacle with a square hole of 50 mm×50 mm was equipped at 210 mm from the ignition source. In the experiment, the high-speed video photography was used to study the flame shape changes and flame front speed. In the numerical simulation, the large eddy simulation (LES) was applied to investigating the flow structure. The results demonstrate that the flame-tip successively takes on a spherical, finger and mushroom-like shape, and the flame begins to propagate in the backward direction after the mushroom-like flame appears. The mushroom-like flame can be explained by the interaction of the flame with two vortexes, and the reverse flow emerged in the flow field leads to the backward motion of the premixed flame. The flame speed is accelerated significantly due to the obstacle and the flame tip speed reaches the maximum value of 17 m/s when the flame passes through the square hole of the obstacle. The flame shape changes and the flow structure observed in the experiments can be well reproduced in the numerical simulations using the LES model. It is indicated that the LES model can be used to predict the premixed flame propagating in an obstructed duct.
- mechanics of explosion,
- flame front surface,
- large eddy simulation,
- high-speed video photography,
- premixed methane/air flame,
- square-hole obstacle

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References(17)

References

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