Experimental research on the influence of orifice plate perturbation on detonation cellular structure characteristics

WU Yuwen; CHU Chi; WENG Chunsheng; ZHENG Quan

doi:10.11883/bzycj-2018-0482

Volume 39 Issue 11

Nov. 2019

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WU Yuwen, CHU Chi, WENG Chunsheng, ZHENG Quan. Experimental research on the influence of orifice plate perturbation on detonation cellular structure characteristics[J]. Explosion And Shock Waves, 2019, 39(11): 112102. doi: 10.11883/bzycj-2018-0482

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WU Yuwen, CHU Chi, WENG Chunsheng, ZHENG Quan. Experimental research on the influence of orifice plate perturbation on detonation cellular structure characteristics[J]. Explosion And Shock Waves, 2019, 39(11): 112102. doi: 10.11883/bzycj-2018-0482

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Experimental research on the influence of orifice plate perturbation on detonation cellular structure characteristics

doi: 10.11883/bzycj-2018-0482

National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2018-11-30
Rev Recd Date: 2019-06-17

Available Online: 2019-10-25

Publish Date: 2019-11-01

Abstract

Abstract

The influence of orifice plate perturbation on detonation cellular structure was experimentally investigated. The cellular structure of detonation wave was recorded in a circular detonation tube withthe smoked film method.The stable mixture 2H₂+O₂+3Ar and unstable mixture C₂H₂+5N₂O and CH₄+2O₂ were used. The correlation between cell size and initial pressure was obtained. The variations of cellular structure upstream and downstream of perturbation were studied, and influence of cellular instability oncellular structure characteristics was analyzed. The characteristic length scaleofdetonation recovery from perturbation was obtained. The results show that after the perturbation the main cell structure becomes irregular when no secondary cells appearfor the stable mixture,while for the unstable mixture, the secondary modes of the detonation wave downstream of the perturbationareinitially suppressed, subsequently the local explosions and fine cellsare generated due to the cellular instability. The detonation wave propagates some distance and recovers to the equilibrium state. This characteristic length varies within the range of 8 to 15 timesthe cell size, while it does not change with the initial pressure. The resultimplies that the characteristic length scale of the detonation wave recovery fromthe perturbationequatesto the detonation hydrodynamic thickness.
- detonation wave,
- orifice plate perturbation,
- cellular instability,
- characteristic length scale

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References(25)

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