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

被引:6
作者
Short, Mark [1 ]
Anderson, Eric K. [1 ]
Chiquete, Carlos [1 ]
Jackson, Scott, I [1 ]
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87544 USA
关键词
Detonation; Condensed-phase; Arc geometry; Curvature; Diffraction; PROPAGATION;
D O I
10.1016/j.proci.2020.07.107
中图分类号
O414.1 [热力学];
学科分类号
摘要
We examine the diffraction dynamics of a two-dimensional (2D) detonation in a circular arc of the conven-tional 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 mu m. In this configuration, a steady propagating det-onation 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 sur -face 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 deto-nation 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 conven-tional 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 detonation propaga-tion. In addition, streamline paths and reaction progress isolines are calculated. We conclude that a common approximation for modeling conventional high explosive detonation, wherein the shock-nor mal detonation speed is assumed equal to the Chapman-Jouguet speed, can lead to significant errors in describing the speed at which the detonation propagates. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:3683 / 3690
页数:8
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