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Unsteady self-sustained detonation in flake aluminum dust/air mixtures

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Abstract

Self-sustained detonation waves in flake aluminum dust/air mixtures have been studied in a tube of diameter 199 mm and length 32.4 m. A pressure sensor array of 32 sensors mounted around certain circumferences of the tube was used to measure the shape of the detonation front in the circumferential direction and pressure histories of the detonation wave. A two-head spin detonation wave front was observed for the aluminum dust/air mixtures, and the cellular structure resulting from the spinning movement of the triple point was analyzed. The variations in velocity and overpressure of the detonation wave with propagation distance in a cell were studied. The interactions of waves in triple-point configurations were analyzed and the flow-field parameters were calculated. Three types of triple-point configuration have been found in the wave front of the detonation wave of an aluminum dust/air mixture. Both strong and weak transverse waves exist in the unstable self-sustained detonation wave.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 11572044).

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Authors and Affiliations

  1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Haidian District, Beijing, 100081, China

    Q. Liu, S. Li, J. Huang & Y. Zhang

  2. Department of Fire Protection Engineering, Chinese People’s Armed Police Force Academy, Langfang, China

    Y. Zhang

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  1. Q. Liu
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  2. S. Li
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  3. J. Huang
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  4. Y. Zhang
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Correspondence to Q. Liu.

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Communicated by D. Frost.

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Liu, Q., Li, S., Huang, J. et al. Unsteady self-sustained detonation in flake aluminum dust/air mixtures. Shock Waves 27, 641–654 (2017). https://doi.org/10.1007/s00193-016-0702-8

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  • DOI: https://doi.org/10.1007/s00193-016-0702-8

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