Gaseous nitromethane and nitromethane-oxygen mixtures: A new detonation structure |
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Authors: | H N Presles D Desbordes M Guirard C Guerraud |
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Institution: | (1) Laboratoire de Combustion et de Détonique, UPR 9028 CNRS, ENSMA-Site du Futuroscope, BP 109, F-86960 Futuroscope Cedex, France |
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Abstract: | Detonation in gaseous nitromethane (NM) and mixed with O2 has been studied. Experiments were performed in a preheated steel tube at an initial temperatureT
0∼=390 K for different initial pressuresP
0 (1.7≥P
0≥5 10−2 bar). Different selfsustained detonation regimes were obtained, from multiheaded mode to spinning and galloping mode in marginal
conditions. These chemical systems were characterized by a specific detonation cellular structure very different from that
currently observed with classical gaseous C
n
H
m
/O2/N2 mixtures. All modes of detonation propagation in rich NM/O2 mixtures exhibit a double scale cellular structure. The pattern of this double scale structure is particularly clear in the
case of spinning mode.
An abridged version of this paper was presented at the 15th Int. Colloquium on the Dynamics of Explosions and Reactive Systems
at Boulder, Colorado, from July 30 to August 4, 1995 |
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Keywords: | Detonation Gaseous nitromethane Cellular structure Spinning detonation Detonation limits |
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