Low-velocity detonation limits of gaseous mixtures |
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Authors: | V I Manzhalei |
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Affiliation: | (1) Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, 630090 Novosibirsk |
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Abstract: | Low-velocity detonation regimes in acetylene-oxygen mixtures are studied experimentally. Data are obtained on the kinematics
of detonation waves and on the boundaries of the high-velocity, galloping, and low-velocity detonation regions. In lean mixtures,
the lower pressure limit for the detonation regimes in narrow channels is found to be an order of magnitude lower than assumed
previously under the assumption that the limiting detonation is always spin detonation. The major structural characteristics
of low-velocity detonations are calculated. The boundary between low-velocity and galloping detonation is found to correspond
almost exactly to equality between the induction time in a particle and the time for it to move from shock wave to flame.
Nearly harmonic oscillations of the flame are observed with periods that are related to the longitudinal size of low-velocity
detonation waves.
Translated fromFizika Goreniya i Vzryva, Vol. 35, No. 3, pp. 89–96, May–June 1999. |
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