Detonation propagation for shock-driven, subsonic and supersonic confiner flow

Journal Article · 20 December 2019 · Journal of Fluid Mechanics

DOI: https://doi.org/10.1017/jfm.2019.997 · OSTI ID:1711379

Short, Mark  ^[1]; Chiquete, Carlos  ^[1]; Quirk, James J. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this work, we study the compressible flow dynamics of two-dimensional, steady detonation wave propagation in a high explosive (HE) confined by aluminium (Al) or stainless steel (SS), outside of which is an air layer. We examine how the thickness of the confinement affects the subsonic detonation driving zone structure (DDZ) and the detonation speed (D₀), demonstrating a strong dependence on whether the oblique shock-driven flow in the confiner is supersonic, as for SS, or subsonic, as for Al. A characteristic path analysis is used to examine the information flow from the material boundaries through the supersonic flow regions in both the HE and confiner that can impact the sonic surfaces bounding the subsonic flow regions. It is shown that the nature of gas-dynamic wave reflection off the SS–air or Al–air boundary can significantly influence the DDZ and D₀.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA). Office of Defense Programs (DP) (NA-10)
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1711379
• Report Number(s): LA-UR--19-24011
• Journal Information: Journal of Fluid Mechanics, Journal Name: Journal of Fluid Mechanics Vol. 885; ISSN 0022-1120
• Publisher: Cambridge University PressCopyright Statement
• Country of Publication: United States
• Language: English