Experimental observation of the onset of detonation downstream of a perforated plate |
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Authors: | J-S Grondin John H S Lee |
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Institution: | (1) Uppsala University, Sweden |
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Abstract: | In this study, the onset of detonation downstream of a perforated plate subsequent to the reflection of a Chapman–Jouguet
detonation upstream is investigated. The experiments were performed with C3H8 + 5O2 and C2H2+2.5O2+70%Ar. The former has a much more irregular transverse wave pattern whereas the latter is known to have a piecewise laminar
structure with a regular cellular structure. The onset of detonation phenomenon was found to be significantly different for
the two mixtures. For the high argon diluted mixtures, the onset of detonation occurs in the vicinity downstream of the perforated
plate. However, if the onset of detonation does not occur close to the plate, the precursor shock decouples from the reaction
zone and a deflagration results. For the propane–oxygen mixtures, the onset of detonation is found to occur relatively far
from the perforated plate at critical conditions. The major difference between these two mixtures is that the metastable turbulent
reaction front can be maintained for relatively long distances for the propane–oxygen mixture. This turbulent metastable regime
is also observed to be able to maintain a relatively constant propagation velocity for many channel widths prior to the onset
of detonation. For the propane–oxygen mixtures, the onset is caused by a strong local explosion within the turbulent reaction
zone. |
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Keywords: | |
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