Experimental study on incentive effect of flexible obstacle on methane-air explosion wave

ZHANG Yanwei; XU Jingde; HU Yang; TIAN Siyu; FENG Ruochen; QIN Hansheng

doi:10.11883/bzycj-2020-0144

Volume 41 Issue 5

May 2021

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ZHANG Yanwei, XU Jingde, HU Yang, TIAN Siyu, FENG Ruochen, QIN Hansheng. Experimental study on incentive effect of flexible obstacle on methane-air explosion wave[J]. Explosion And Shock Waves, 2021, 41(5): 055402. doi: 10.11883/bzycj-2020-0144

Citation:

ZHANG Yanwei, XU Jingde, HU Yang, TIAN Siyu, FENG Ruochen, QIN Hansheng. Experimental study on incentive effect of flexible obstacle on methane-air explosion wave[J]. Explosion And Shock Waves, 2021, 41(5): 055402. doi: 10.11883/bzycj-2020-0144

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Experimental study on incentive effect of flexible obstacle on methane-air explosion wave

doi: 10.11883/bzycj-2020-0144

College of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, Hebei, China

Received Date: 2020-05-11
Rev Recd Date: 2020-06-22

Available Online: 2021-04-21

Publish Date: 2021-05-05

Abstract

Abstract

In order to study the incentive effect of flexible obstacles on methane-air explosion waves, a biaxially oriented polypropylene ( BOPP) film was used as a flexible obstacle to separate the methane-air premixed gas from the air in the pipeline, the difference of the flame and shock wave before and after they propagated through the obstacle was compared, and the mechanism of the incentive effect of the flexible membrane obstacle was analyzed. The experimental results show that the incentive effect of this flexible obstacle with certain pressure-bearing capacity on the methane explosion wave cannot be ignored. Multiple reflections of shock wave before the rupture of the flexible membrane can result in the formation of turbulent flame, and thus greatly increase the explosion pressure. After the rupture of the flexible membrane, the velocity of the flame increases suddenly under the action of the concomitant flow and approaches the shock wave, resulting in a great increase in the explosion pressure behind the membrane. The experimental data show that the difference in the maximum explosion pressure between the locations before and after the membrane is five times and the corresponding difference of flame velocity is seven times. In addition, it is found that the incentive effect can be enhanced by adding an additional membrane after the original one with a prescribed distance and the essential role of the additional membrane is to increase the interaction numbers between the shock wave and the flame.
- methane-air explosion,
- flexible obstacle,
- incentive effect,
- shock wave

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References(23)

References

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