Abstract
The effect of initial pressure on aluminum particles–air detonation was experimentally investigated in a 13 m long, 80 mm diameter tube for 100 nm and 2 µm spherical particles. While the 100 nm Al–air detonation propagates at 1 atm initial pressure in the tube, transition to the 2 µm aluminum–air detonation occurs only when the initial pressure is increased to 2.5 atm. The detonation wave manifests itself in a spinning wave structure. An increase in initial pressure increases the detonation sensitivity and reduces the detonation transition distance. Global analysis suggests that the tube diameter for single-head spinning detonation or characteristic detonation cell size would be proportional to \(d_{0}^{n} / p_{0}^{m}\) (d 0: aluminum particle size, p 0: initial pressure). Its application to the experimental data results in m ~ O(1) and n ~ O(1) for 1 to 2 µm aluminum–air detonation, thus indicating a strong dependence on initial pressure and gas-phase kinetics for the aluminum reaction mechanism in detonation. Hence, combustion models based on the fuel droplet diffusion theory may not be adequate in describing micrometric aluminum–air detonation initiation, transition and propagation. For 2 µm aluminum–air mixtures at 2 atm initial pressure and below, experiments show a transition to a “dust quasi-detonation” that propagates quasi-steadily with a shock velocity deficit nearly 40% with respect to the theoretical C–J detonation value. The dust quasi- detonation wave can propagate in a tube with a diameter less than 0.4–0.5 times the diameter required for a spinning detonation wave.
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Zhang, F., Murray, S.B. & Gerrard, K.B. Aluminum Particles–air Detonation at Elevated Pressures. Shock Waves 15, 313–324 (2006). https://doi.org/10.1007/s00193-006-0027-0
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DOI: https://doi.org/10.1007/s00193-006-0027-0