Self-sustained detonation waves in flake aluminum dust/air mixtures have beenstudied in a tube of diameter 199 mm and length 32.4 m. A pressure sensor arrayof 32 sensors mounted around certain circumferences of the tube was used tomeasure the shape of the detonation front in the circumferential direction andpressure histories of the detonation wave. A two-head spin detonation wavefront was observed for the aluminum dust/air mixtures, and the cellularstructure resulting from the spinning movement of the triple point wasanalyzed. The variations in velocity and overpressure of the detonation wavewith propagation distance in a cell were studied. The interactions of waves intriple-point configurations were analyzed and the flow-field parameters werecalculated. Three types of triple-point configuration exist in the wave frontof the detonation wave of an aluminum dust/air mixture. Both strong and weaktransverse waves exist in the unstable self-sustained detonation wave.
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