Mechanisms of Detonation Initiation under the Effect of Perturbation

ZHANG Jingwen; PENG Ao; CHEN Xianfeng; SUN Xuxu

doi:10.11858/gywlxb.20220600

Volume 36 Issue 6

Dec 2022

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Chinese Journal of High Pressure Physics > 2022 > 36(6): 062303.

ZHANG Jingwen, PENG Ao, CHEN Xianfeng, SUN Xuxu. Mechanisms of Detonation Initiation under the Effect of Perturbation[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600

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ZHANG Jingwen, PENG Ao, CHEN Xianfeng, SUN Xuxu. Mechanisms of Detonation Initiation under the Effect of Perturbation[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 062303. doi: 10.11858/gywlxb.20220600

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Mechanisms of Detonation Initiation under the Effect of Perturbation

doi: 10.11858/gywlxb.20220600

School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, Hubei, China

Received Date: 31 May 2022
Rev Recd Date: 13 Jun 2022

Available Online: 12 Nov 2022

Issue Publish Date: 05 Dec 2022

Abstract

Abstract

This paper aims to experimentally and numerically investigate the effect of perturbation on the detonation initiation. In a round tube with 90 mm inner diameter, a stable detonation is firstly failed by an orifice plate with the blockage ratio of 0.923, and then the small-scale perturbation created by a cylindrical obstacle with a 2 mm diameter is introduced to a position 0.5 m downstream of the orifice plate to study the role of the perturbation on detonation re-initiation. Three different obstacles with blockage ratio of 0.03, 0.04 and 0.07 can be obtained by changing the number of the cylindrical obstacles equal to 1, 2 and 3. PCB gauges are used to record the time-of-arrival of the detonation, from which the detonation speed can be calculated. The smoked foil technique is used to record the cellular structures. The experimental results indicate that the small-scale perturbation can significantly facilitate the detonation initiation, and the critical pressure can be decreased from 37 kPa to 25 kPa in the smooth tube. By analyzing the cellular structures, it can be found that the perturbation can enhance the cellular instability inducing the local explosion centers, which is the main reason causing the detonation initiation. Near the limit, the detonation initiation mechanism can be approximately quantified as D_H/λ>1, where D_H is hydraulic diameter and λ represents the cell size. In the simulation, the reactive Euler equations are used as the governing equations and two-step induction-reaction rate law is considered. The numerical results indicate that the disturbance with lower wavelength and amplitude can induce more transverse waves and enhance the cellular instabilities, facilitating the detonation initiation.
- perturbation,
- detonation initiation,
- instability,
- amplitude,
- wavelength

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References(39)

References

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Mechanisms of Detonation Initiation under the Effect of Perturbation

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