Small-scale tunnel test for blast performance

Felts, Joshua; Lee, R J

doi:10.1088/1742-6596/500/18/182011

Cited by 1 publication

(2 citation statements)

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“…[3] The initial energy released into the blast wave in the tunnel was measured by time of arrival and is the focus of this paper, whereas later reactions enhance the impulse down range. Data from these two experiments together allowed us to partition the energy of the blast wave between anaerobic and aerobic energy of the explosive.…”

Section: Description Of Experimentsmentioning

confidence: 99%

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Partitioning of initial energy release in a tunnel environment

Felts¹,

Lee²,

Mychajlonka³

et al. 2017

AIP Conference Proceedings

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Abstract. After the detonation of an explosive charge in the closed end of a tunnel, product gases and metal fuels can continue to react with one another as well as combust with the available air while expanding down the tunnel. It is that total reaction that drives the blast wave at long distances from the charge. The initial energy release was calculated from pressure wave time of arrival at distances of 5 to 30 tunnel diameters away for several explosives in a 127-mm diameter tunnel using point blast theory. For similarly sized explosives, the anaerobic energy was measured using a detonation calorimeter. Comparisons were made for four explosives: one nearly ideal, two with aluminum, and one with aluminum and an oxidizer. The measured tunnel and calorimeter energies were equal, within error, for the near-ideal explosive. The other three explosives had tunnel and calorimeter energies higher than that which can be accounted for from the detonable ingredients alone, especially in the tunnel. The differences between the tunnel and calorimeter for the three aluminized explosives were taken to be from aerobic combustion of aluminum. The presence of higher concentrations of aluminum or an oxidizer enhanced the amount of aerobic combustion of aluminum. The aluminized explosive with additional oxidizer consumed more than twice the aluminum of the other two in the tunnel. More experiments are needed to better define the early partitioning of anaerobic and aerobic combustion of aluminum in the small-scale tunnel.

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Section: Description Of Experimentsmentioning

confidence: 99%

“…Performance metrics include initial energy release, peak pressure, and impulse. [3] This paper only focuses on the metric of initial energy release, which was calculated from blast wave time of arrival measurements and the methodology in reference 3. Table 1 provides a description of the four explosives examined in this study.…”

Section: Detonation Calorimetermentioning

confidence: 99%