Aluminium dust-air detonation at elevated pressures
Understanding the detonability of aluminium particles suspended in air at elevated pressures is important in problems associated with industrial safety, stagnation flow, or shocked flow conditions. While micrometric aluminium dust-air detonation at atmospheric conditions is feasible in large tubes using a strong initiation source [1, 2, 3, 4], the detonation properties and structure at elevated pressures have not been carefully investigated. For organic dust with a high volatile content, the detonation sensitivity is increased with increasing initial pressure, approximately following the scaling rule of gaseous detonations in which the detonation cell size is inversely proportional to initial pressure [4, 5]. However, aluminium particles possess an oxide layer that has a high melting temperature, thus increasing the difficulty of detonation initiation and the understanding of the detonation mechanism. The aim of the present paper is to study the influence of elevated initial pressures on the detonation properties and structure in aluminium dust-air mixtures. To understand the scaling effect of particle size, experiments were carried out for a nanometric and a micrometric aluminium particle size at various particle concentrations.
KeywordsShock Front Initial Pressure Aluminium Particle Detonation Velocity Dust Concentration
Unable to display preview. Download preview PDF.
- 1.A.J. Tulis, J.R. Selman: ‘Detonation Tube Studies of Aluminium Particles Dispersed in Air’. In: Proceedings of the 19th Symp (Intl.) on Comb, (The Combustion Institute, Pittsburgh 1982) pp. 655–663Google Scholar
- 2.A.J. Tulis: In: 8th Int. Symp. On Dust Detonations, (1998)Google Scholar
- 3.A.A. Borisov, B.A. Khasainov, E.L. Saneev, I.B. Formin, S.V. Khomik, B. Veyssiere: ‘On the Detonation of Aluminium Suspensions in Air and in Oxygen’. In: Dynamic Structure of Detonation in Gaseous and Dispersed Media, ed. by A.A. Borisov (Kluwer Academic Publishers, Dordrecht 1991) pp. 215–253CrossRefGoogle Scholar
- 7.L.E. Fried, W.M. Howard, P.C. Souers: Cheetah 2.0 User’s Manual. Lawrence Livermore National Laboratory, UCRL-MA-117541 Rev. 5 (1998)Google Scholar