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Modeling and numerical simulation of deflagration-to-detonation transition in porous energetic materials.

机译:多孔含能材料爆燃-爆轰过渡过程的建模与数值模拟。

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摘要

An understanding of the deflagration-to-detonation transition (DDT) in porous energetic materials is important for various engineering applications. Safety issues for damaged explosives is one example. In this work, two topics related to multi-dimensional simulation of DDT in energetic materials are presented.; The objective of the first part is to develop a simple and predictive model for multidimensional simulations. Models constructed by two-phase mixture theory usually have complicated mathematical formulation, and admit complex dispersive wave structures. Three simplified single-velocity models, named BKS, SVG and GISPA, are considered in this work. The BKS model was derived--using asymptotic theory--from the two-phase theory by assuming a large interphase drag. The SVG model is newly developed, based on solid-void-gas three-phase formulation. The GISPA model is a new single-phase model which utilizes two independent rate processes for compaction and reaction. In addition to model simplification, a new reaction rate law is developed which describes the slow and the fast energy-release processes during DDT. A comparative study is carried out and the study shows that the SVG and GISPA models are able to predict all the events measured in 1-D DDT-tube experiments.; The second part of the study describes the development of a high-quality numerical method for two-dimensional DDT simulations. The new fourth-order method integrates total variation diminishing and essentially non-oscillatory schemes with an extension to a general equation of state. In order to handle complex geometry, an internal boundary algorithm is developed on a structured grid, which allows a two-dimensional, non-deformable body of an arbitrary shape to be inserted in a flow field. A DDT simulation is carried out for cases of both blunt-body and sharp-body impact on porous energetic materials. The radius effect (in the case of blunt-body impact) and the angle effect (in the case of sharp-body impact) on detonation properties are studied.
机译:对多孔高能材料中的爆燃-爆轰过渡(DDT)的理解对于各种工程应用很重要。损坏的炸药的安全问题就是一个例子。在这项工作中,提出了与高能材料中滴滴涕多维模拟有关的两个主题。第一部分的目的是为多维仿真开发一个简单且可预测的模型。由两相混合理论构建的模型通常具有复杂的数学公式,并且允许复杂的色散波结构。这项工作考虑了三个简化的单速度模型,分别称为BKS,SVG和GISPA。 BKS模型是使用渐近理论从两相理论推导出的,假设相间阻力较大。 SVG模型是基于固体-空隙气体三相配方新开发的。 GISPA模型是一种新的单相模型,它利用两个独立的速率过程进行压实和反应。除了简化模型之外,还开发了一种新的反应速率定律,该定律描述了滴滴涕过程中的缓慢和快速能量释放过程。进行了比较研究,该研究表明SVG和GISPA模型能够预测一维DDT管实验中测得的所有事件。研究的第二部分描述了二维DDT模拟的高质量数值方法的发展。新的四阶方法将总变化量减小和本质上非振荡的方案集成到状态方程的扩展中。为了处理复杂的几何形状,在结构化网格上开发了内部边界算法,该算法允许将任意形状的二维,不可变形的物体插入流场中。 DDT模拟针对钝性和锐利性对多孔高能材料的影响进行了模拟。研究了半径效应(在钝体撞击的情况下)和角度效应(在锐体撞击的情况下)对爆炸性能的影响。

著录项

  • 作者

    Xu, Shaojie.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Applied Mechanics.; Engineering Mechanical.; Engineering Mining.; Engineering Civil.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用力学;机械、仪表工业;矿业工程;建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:49:14

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