Pressure profiles in detonation cells with rectangular and diagonal structures |
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Authors: | M Hanana MH Lefebvre |
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Institution: | (1) Laboratoire de Physico-Chimie de la Combustion, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium , BE |
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Abstract: | Experimental results presented in this work enable us to classify the three-dimensional structure of the detonation into
two fundamental types: a rectangular structure and a diagonal structure. The rectangular structure is well documented in the
literature and consists of orthogonal waves travelling independently from each another. The soot record in this case shows
the classical diamond detonation cell exhibiting ‘slapping waves’. The experiments indicate that the diagonal structure is
a structure with the triple point intersections moving along the diagonal line of the tube cross section. The axes of the
transverse waves are canted at 45 degrees to the wall, accounting for the lack of slapping waves. It is possible to reproduce
these diagonal structures by appropriately controlling the experimental ignition procedure. The characteristics of the diagonal
structure show some similarities with detonation structure in round tube. Pressure measurements recorded along the central
axis of the cellular structure show a series of pressure peaks, depending on the type of structure and the position inside
the detonation cell. Pressure profiles measured for the whole length of the two types of detonation cells show that the intensity
of the shock front is higher and the length of the detonation cell is shorter for the diagonal structures.
Received 17 May 2000 / Accepted 29 November 2000 |
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Keywords: | :Gaseous detonation 3D-structures Detonation cells Shock pressure measurements |
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