Multi-hole obstacles’ effects on premixed flame’s propagation

CHENG Fangming; CHANG Zhuchuan; SHI He; GAO Tongtong; LUO Zhenmin; GE Tianjiao

doi:10.11883/bzycj-2019-0480

Volume 40 Issue 8

Aug. 2020

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CHENG Fangming, CHANG Zhuchuan, SHI He, GAO Tongtong, LUO Zhenmin, GE Tianjiao. Multi-hole obstacles’ effects on premixed flame’s propagation[J]. Explosion And Shock Waves, 2020, 40(8): 082103. doi: 10.11883/bzycj-2019-0480

Citation:

CHENG Fangming, CHANG Zhuchuan, SHI He, GAO Tongtong, LUO Zhenmin, GE Tianjiao. Multi-hole obstacles’ effects on premixed flame’s propagation[J]. Explosion And Shock Waves, 2020, 40(8): 082103. doi: 10.11883/bzycj-2019-0480

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Multi-hole obstacles’ effects on premixed flame’s propagation

doi: 10.11883/bzycj-2019-0480

1.
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
2.
Xi’an Institute of Space Radio Technology, Xi’an 710100, Shaanxi, China

Received Date: 2019-12-25
Rev Recd Date: 2020-02-16

Available Online: 2020-07-25

Publish Date: 2020-08-01

Abstract

Abstract

Taking methane as the representative gas, the effect of setting multi-hole obstacle in semi-enclosed pipe on the flame propagation of flammable gas explosion was studied, and the experiment was reproduced based on the large eddy simulation (LES), the shape, position and speed of flame propagation were compared in the experiment and simulation, the flow field and area change of the flame before and after the obstacle were analyze and then the method of measuring the refractory rate of the flame is proposed. The results show that the LES results are in good consistency with the experimental results. Flame propagation has gone through four stages in the duct, followed by the layer flow bubbles rapid expansion stage, the flame pulsation reflux stage, the turbulent flame rapid development stage, the flame deceleration stabilization stage, in which the speed of the flame fluctuates. After the flame has passed through the multi-hole obstacles, the propagation speed suddenly rises to a peak value, which is 58.7% higher than the maximum speed in front of the obstacle. The discharge vent and ignition are at the same end in the duct, when the flame is near the obstacle, which is effected by the top of pipe and obstacle significantly, and the speed would be negative and the flame will flow back. Obstacles are the direct cause of the broken layer flow bubbles and the increase of area fold rate, the maximum flame fold rate is 44.8% after flame passed the obstacle, which is increased by 36.72%.
- methane explosion,
- large eddy simulation,
- flame front,
- multi-hole obstacle,
- flame folding rate

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References(22)

References

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