Simulation on dynamic pressure of premixed methane/air explosion in open-end pipes

Hong Yidu; Lin Baiquan; Zhu Chuanjie

doi:10.11883/1001-1455(2016)02-0198-12

Volume 36 Issue 2

Oct. 2018

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Article Navigation > Explosion And Shock Waves > 2016 > 36(2): 198-209

Hong Yidu, Lin Baiquan, Zhu Chuanjie. Simulation on dynamic pressure of premixed methane/air explosion in open-end pipes[J]. Explosion And Shock Waves, 2016, 36(2): 198-209. doi: 10.11883/1001-1455(2016)02-0198-12

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Hong Yidu, Lin Baiquan, Zhu Chuanjie. Simulation on dynamic pressure of premixed methane/air explosion in open-end pipes[J]. Explosion And Shock Waves, 2016, 36(2): 198-209. doi: 10.11883/1001-1455(2016)02-0198-12

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Simulation on dynamic pressure of premixed methane/air explosion in open-end pipes

doi: 10.11883/1001-1455(2016)02-0198-12

State Key Laboratory of Coal Resources and Safe Mining, Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

Received Date: 2014-08-18
Rev Recd Date: 2014-10-24
Publish Date: 2016-03-25

Abstract

Abstract

In order to study the evolution of dynamic overpressure of deflagration, a simulation was carried out in an open end pipe. It was found that the dynamic pressure was closely correlated with the gas velocity so that they always arrive at the peak value at the same time. In addition, the first positive peak of the dynamic pressure was almost several times greater than that of the second. This may indicate that the blast wave has a greater influence on the dynamic pressure than the flame does. An empirical prediction equation was given to calculate the first and second positive peaks based on the propagation time. Maximum dynamic pressures were increased with the propagation distance in all the three directions (x, y and z), and so was with time. The maximum dynamic pressure value in the x direction was almost several thousand times greater than those in the other two directions. Compared with the explosive overpressure, the influence on the explosive damage by the dynamic pressure in the y and z direction was quite small. Three empirical formulas were given to calculate the maximum dynamic pressures in different directions. The relationship between the dynamic pressure and the square of the gas velocity was verified. An empirical formula of the dynamic overpressure was also given based on the length-diameter ratio and the gas velocity. The results may provide a reference for the study on the gas explosion in the limited spaces.
- mechanics of explosion,
- dynamic pressure,
- pipe size,
- methane/air explosion,
- open-end pipes,
- gas velocity

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References

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