Wave dynamic processes in cellular detonation reflection from wedges |
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Authors: | Zongmin Hu Zonglin Jiang |
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Institution: | (1) LHD, Institute of Mechanics, CAS, Beijing, 100080, China;(2) ReCAPT, Gyeongsang National University, Jinju, Kyeongnam, 660-701, South Korea |
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Abstract: | When the cell width of the incident detonation wave (IDW) is comparable to or larger than the Mach stem height, self-similarity
will fail during IDW reflection from a wedge surface. In this paper, the detonation reflection from wedges is investigated
for the wave dynamic processes occurring in the wave front, including transverse shock motion and detonation cell variations
behind the Mach stem. A detailed reaction model is implemented to simulate two-dimensional cellular detonations in stoichiometric
mixtures of H
2/O
2 diluted by Argon. The numerical results show that the transverse waves, which cross the triple point trajectory of Mach reflection,
travel along the Mach stem and reflect back from the wedge surface, control the size of the cells in the region swept by the
Mach stem. It is the energy carried by these transverse waves that sustains the triple-wave-collision with a higher frequency
within the over-driven Mach stem. In some cases, local wave dynamic processes and wave structures play a dominant role in
determining the pattern of cellular record, leading to the fact that the cellular patterns after the Mach stem exhibit some
peculiar modes.
The English text was polished by Yumming Chen. |
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Keywords: | Cellular detonation Wedge Reflection Wave dynamics Simulation |
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