Title: Experimental and modeling analysis of detonation in circular arcs of the conventional high explosive PBX 9501

Abstract

We examine the diffraction dynamics of a two-dimensional (2D) detonation in a circular arc of the conventional HMX-based, high performance, solid explosive PBX 9501, for which the detonation reaction zone length scale is estimated to be of the order of 100–150 µm. In this configuration, a steady propagating detonation will develop, sweeping around the arc with constant angular speed. We report on results from three PBX 9501 arc experiments, exploring the variation in linear speed on the inner and outer arc surfaces for the steady wave along with the structure of the curved detonation front, as a function of varying inner surface radius and arc thickness. Comparisons of the properties of the motion of the steady wave for each arc configuration are then made with a spatially-distributed PBX 9501 reactive burn model, calibrated to detonation performance properties in a 2D planar slab geometry. We show that geometry-induced curvature of the detonation near the inner arc surface has a significant effect on the detonation motion even for conventional high explosives. We also examine the detonation driving zone structure for each arc case, and thus the subsonic regions of the flow that determine the influence of the arc geometry on the detonationmore » propagation. In addition, streamline paths and reaction progress isolines are calculated. Overall, we conclude that a common approximation for modeling conventional high explosive detonation, wherein the shock-normal detonation speed is assumed equal to the Chapman–Jouguet speed, can lead to significant errors in describing the speed at which the detonation propagates.« less

Authors:

Short, Mark  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-6081-9996"

Anderson, Eric Karl  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-5309-5686"

Chiquete, Carlos  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-0467-5959"

Jackson, Scott I.  ^[1]

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• Search DOE PAGES for ORCID "0000-0002-6814-3468"

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+ Show Author Affiliations

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

Publication Date:

Tue Oct 27 00:00:00 EDT 2020

Research Org.:

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

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA). Office of Defense Nuclear Nonproliferation

OSTI Identifier:

1726180

Report Number(s):

LA-UR-19-31003
Journal ID: ISSN 1540-7489

Grant/Contract Number:  

89233218CNA000001

Resource Type:

Accepted Manuscript

Journal Name:

Proceedings of the Combustion Institute

Additional Journal Information:

Journal Volume: 38; Journal Issue: 3; Conference: 38.International Symposium on Combustion, Adelaide (Australia), 24-29 Jan 2021; Journal ID: ISSN 1540-7489

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING; Detonation; condensed-phase; arc geometry; curvature; diffraction