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Title: Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502

Abstract

We describe the details of an unconfined insensitive high explosive (PBX 9502) circular arc section experiment, in which, after a transient period, a detonation sweeps around the arc with constant angular speed. The arc section is sufficiently wide that the flow along the centerline of the arc section remains two-dimensional. Data includes time-of-arrival diagnostics of the detonation along the centerline inner and outer arc surfaces, which is used to obtain the angular speed of the steadily rotating detonation. We also obtain the lead shock shape of the detonation as it sweeps around the arc. Reactive burn model simulations of the PBX 9502 arc experiment are then conducted to establish the structure of the detonation driving zone, i.e. the region enclosed between the detonation shock and flow sonic locus (in the frame of the steady rotating detonation). It is only the energy released in this zone which determines the speed at which the steady detonation sweeps around the arc. We show that the sonic flow locus of the detonation driving zone largely lies at the end of, or within, the fast reaction stage of the PBX 9502 detonation, with the largest section of the detonation driving zone lying close to themore » inner arc surface. In conclusion, we also demonstrate that the reactive burn model provides a good prediction of both the angular speed of the detonation wave and the curved detonation front shape.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1483504
Report Number(s):
LA-UR-18-21403
Journal ID: ISSN 0010-2180
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 196; Journal Issue: C; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Short, Mark, Chiquete, Carlos, Bdzil, John Bohdan, and Quirk, James J. Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502. United States: N. p., 2018. Web. doi:10.1016/j.combustflame.2018.06.002.
Short, Mark, Chiquete, Carlos, Bdzil, John Bohdan, & Quirk, James J. Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502. United States. doi:10.1016/j.combustflame.2018.06.002.
Short, Mark, Chiquete, Carlos, Bdzil, John Bohdan, and Quirk, James J. Wed . "Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502". United States. doi:10.1016/j.combustflame.2018.06.002. https://www.osti.gov/servlets/purl/1483504.
@article{osti_1483504,
title = {Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502},
author = {Short, Mark and Chiquete, Carlos and Bdzil, John Bohdan and Quirk, James J.},
abstractNote = {We describe the details of an unconfined insensitive high explosive (PBX 9502) circular arc section experiment, in which, after a transient period, a detonation sweeps around the arc with constant angular speed. The arc section is sufficiently wide that the flow along the centerline of the arc section remains two-dimensional. Data includes time-of-arrival diagnostics of the detonation along the centerline inner and outer arc surfaces, which is used to obtain the angular speed of the steadily rotating detonation. We also obtain the lead shock shape of the detonation as it sweeps around the arc. Reactive burn model simulations of the PBX 9502 arc experiment are then conducted to establish the structure of the detonation driving zone, i.e. the region enclosed between the detonation shock and flow sonic locus (in the frame of the steady rotating detonation). It is only the energy released in this zone which determines the speed at which the steady detonation sweeps around the arc. We show that the sonic flow locus of the detonation driving zone largely lies at the end of, or within, the fast reaction stage of the PBX 9502 detonation, with the largest section of the detonation driving zone lying close to the inner arc surface. In conclusion, we also demonstrate that the reactive burn model provides a good prediction of both the angular speed of the detonation wave and the curved detonation front shape.},
doi = {10.1016/j.combustflame.2018.06.002},
journal = {Combustion and Flame},
issn = {0010-2180},
number = C,
volume = 196,
place = {United States},
year = {2018},
month = {6}
}

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