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Anatomy of a diffracting detonation in a circular arc of explosive

Journal Article · · Journal of Fluid Mechanics
DOI:https://doi.org/10.1017/jfm.2018.81· OSTI ID:1434432
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Using high-resolution numerical simulation, study diffraction of a detonation as it traverses a 270° finite-thickness condensed-phase explosive arc. This geometry admits a steady solution in a frame rotating with angular speed ω0, which thereby facilitates a detailed analysis of how the loss of energy from the detonation reaction zone due to the diffraction process slows the propagation of the detonation. There exists a region of subsonic flow, between the detonation shock and the curve of sonic flow (labelled the DDZ), which is responsible for setting ω0. Although the DDZ spans the entire thickness for thin arcs, it is localized to a region near the inside surface as the arc is thickened. Furthermore the explosive energy release near this inside surface plays a disproportionate role in the diffraction process.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1434432
Report Number(s):
LA-UR--17-31328
Journal Information:
Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 840; ISSN applab; ISSN 0022-1120
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (4)

Stable detonation wave propagation in rectangular-cross-section curved channels journal February 2012
Steady detonation propagation in a circular arc: a Detonation Shock Dynamics model journal October 2016
Detonation propagation in a circular arc: reactive burn modelling journal November 2017
A study of detonation diffraction in the ignition-and-growth model journal September 2007

Figures / Tables (2)

Figure 1(p. 3)figure Figure 1
Figure 2(p. 4)figure Figure 2

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Related Subjects

42 ENGINEERING
compressible flows
detonation waves