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Flame spread through cracks of PBX 9501 (a composite octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine-based explosive)
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10.1063/1.2196219
/content/aip/journal/jap/99/11/10.1063/1.2196219
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/11/10.1063/1.2196219

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Short-slot cell used in slot flame-spread experiments at initially elevated pressures. Sample dimensions are with an slot between the two pieces of PBX 9501. This sample exhibited oscillatory combustion in the slot and extinguished before all of the material was consumed. The enlarged slot opening that is visible in the assembled view on the left is the result of sample erosion near the slot opening.

Image of FIG. 2.
FIG. 2.

(Color online) Unassembled long-slot cell with the sample used in highly confined slot flame-spread experiments. Sample dimensions are with an slot between the two pieces of PBX 9501.

Image of FIG. 3.
FIG. 3.

Sequence of video images from the short-slot experiment where no filler is used between sample and cell. The open end of the slot is out of view at the left side of each frame. Each frame bears a time stamp that corresponds to the time coordinate of the pressure traces in Fig. 4. Luminous flame progress is measured at the faintly luminous tip indicated by the arrows in the frames above.

Image of FIG. 4.
FIG. 4.

(Color online) Pressure traces from the short-slot experiment where no filler is used between sample and cell. The legend specifies the pressure transducer position relative to the open end of the slot. The time axis scale corresponds to the image sequence time stamp in Fig. 3.

Image of FIG. 5.
FIG. 5.

(Color online) Pressure traces from the short-slot experiment with filler between sample and cell. The inset specifies the pressure transducer position relative to the open end of the slot. The reported oscillatory frequency is calculated from the time between pressure maxima.

Image of FIG. 6.
FIG. 6.

Sequence of video images from the long-slot experiment. The open end of the slot is out of view at the left side of each frame. Each frame bears a relative time stamp. Luminous flame progress is measured at the faintly luminous tip indicated by the arrows in the frames above.

Image of FIG. 7.
FIG. 7.

(Color online) Pressure traces from the long-slot experiment. The legend specifies the pressure transducer position relative to the open end of the slot.

Image of FIG. 8.
FIG. 8.

(Color online) Long-slot position and velocity plot vs time. The combustion wave position is determined from both the visual record and pressure record. The best fit of the position vs time data is shown as a solid line with a scale on the left axis. The corresponding propagation speed is shown as a dashed line referenced with a scale on the right axis.

Image of FIG. 9.
FIG. 9.

(Color online) Long-slot postmortem image. A high pressurization rate accompanied by high peak pressure caused the long-slot cell to fail. The steel cell broke into fairly large pieces and the acrylic window shattered.

Tables

Generic image for table
Table I.

Summary of short-slot flame-spread experimental results.

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/content/aip/journal/jap/99/11/10.1063/1.2196219
2006-06-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Flame spread through cracks of PBX 9501 (a composite octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine-based explosive)
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/11/10.1063/1.2196219
10.1063/1.2196219
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