Comprehensive visualization of detonation-diffraction structures and sizes in unstable and stable mixtures
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Abstract
The geometry and characteristic length of diffraction and re-initiation during a two-dimensional detonation propagation were revealed by visualization. C2H4 + 3O2 (unstable), 2C2H2 + 5O2 + 7Ar (stable) and 2C2H2 + 5O2 + 21Ar (stable) were used as the test mixtures. Experiments were performed over the deviation angle range from 30° to 150° and the initial pressure range from 15.8 to 102.3 kPa. By self-emitting photography, we confirmed that the geometry and the characteristic length of diffraction are not different among test gases, with the exception of the fan-like structure of re-initiation that occurred regardless of whether the mixture was unstable or stable. We conducted a compensative experiment by changing the deviation angle and initial pressure, and summarized the detonation diffraction by shadowgraph. At deviation angles larger than 60°, we measured the distances from the vertex of the channel corner to the point where the transverse detonation wave reflected on the under wall (= wall reflection distance) and confirmed that wall reflection distances are approximately in the range of 10–15 times the cell width, whether the mixture is unstable or stable.
Journal
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- Proceedings of the Combustion Institute
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Proceedings of the Combustion Institute 34 (2), 1949-1956, 2013
Elsevier Inc.
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Details 詳細情報について
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- CRID
- 1050282677609561216
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- NII Article ID
- 120007137083
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- NII Book ID
- AA11552208
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- ISSN
- 15407489
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- HANDLE
- 2241/118453
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles