Experimental investigation and numerical simulation of flame propagation and quenching process in the in-line crimped-ribbon flame arrester

Sun Shaochen; Bi Mingshu; Ding Chunhui; Hu Xiyu; Liu Gang; Feng Yu

doi:10.11883/1001-1455(2017)02-0353-12

Volume 37 Issue 2

Mar. 2017

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Sun Shaochen, Bi Mingshu, Ding Chunhui, Hu Xiyu, Liu Gang, Feng Yu. Experimental investigation and numerical simulation of flame propagation and quenching process in the in-line crimped-ribbon flame arrester[J]. Explosion And Shock Waves, 2017, 37(2): 353-364. doi: 10.11883/1001-1455(2017)02-0353-12

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Experimental investigation and numerical simulation of flame propagation and quenching process in the in-line crimped-ribbon flame arrester

doi: 10.11883/1001-1455(2017)02-0353-12

Sun Shaochen^{1, 2},
Bi Mingshu^{1
,
,},
Ding Chunhui²,
Hu Xiyu²,
Liu Gang²,
Feng Yu²

1.
School of Chemical Machinery, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
Shenyang Institute of Special Equipment Inspection & Research, Shenyang 110035, Liaoning, China

Received Date: 2015-08-26
Rev Recd Date: 2016-04-01
Publish Date: 2017-03-25

Abstract

Abstract

An experimental system and numerical model were set up to investigate ethylene-air premix deflagration flame propagation and quenching by crimped-ribbon flame arresters in a horizontal pipe, closed at both ends. The deflagration suppression experiment showed that, when the concentration of the flammable gas was close to the stoichiometric ratio (6.6% ethylene by volume), the evolution processes of explosion pressure for the premixed gas of ethylene-air in the pipe (D=32, 80, 400mm) could be divided into four stages: isobaric combustion, slow rise, quick rise and pressure oscillation. During the explosion, due to the interaction between the reflected pressure wave and the flame, the overpressure value fluctuated several times, and the pressure oscillation lasted normally tens of milliseconds. The ethylene-air deflagration flame velocity gradually increased with the increase of the pipe diameter and the decrease of the crimp height. Furthermore, the performance of the flame arrester gradually increased with the increase of the element length. The simulation result showed that the flame front was formed in a semi-sphere shape and spread around in the form of laminar diffusion after ignition at the closed end on the left side. When the flame reached the wall, its shape enlarged under the restriction of the pipe. Then the flame velocity at the near wall gradually exceeded that at the pipe axis, and finally a "tulip" flame was formed. A big amount of heat was lost as the flame front contacted the arrester element, under the influence from the rarefaction waves formed in the reaction area, the chemical reaction rate decreased rapidly, and the flame temperature decreased gradually, which resulted in quenching. During the whole explosion process, the pressure wave and the flame velocity were accompanied by drastic fluctuations through the simulation calculation. The influence mechanism of the porosity and the element length on the flame propagation was analyzed numerically. Finally, the relationship between the deflagration flame velocity and the explosion pressure was derived based on the classic theory of the heat transfer and the experimental data. This study will serve as accurate reference for the design and selection of the crimped-ribbon flame arrester.
- crimped-ribbon flame arrester,
- quenching,
- "tulip" flame,
- deflagration flame velocity,
- explosion pressure

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References(15)

References

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