摘要应用LS-DYNA有限元软件对射流垂直侵彻不同结构及尺寸的饱含液体密闭单元过程进行数值模拟，并以此分析密闭单元内的液体受冲击时的运动情况。其中，单元结构分为圆柱、六棱柱、长方体三种类型，尺寸以内腔直径d、密闭结构壳体壁厚t、内腔高度h分组，采取控制变量法进行数值仿真。结果表明，密闭结构的内腔高度和直径影响液体汇聚的位置和延伸方向，h>d时，出现两个液体汇聚起始点，反之则只有一个，d>30mm时液体汇聚方向沿轴向向上，反之则沿轴线向下；容器壁厚影响液体径向汇聚的强度，随着壁厚增加液体汇聚程度加剧，但壁厚的影响系数也在递减。随着容器内腔直径d的增加，射流受干扰的轴向速度区间延后，容器内腔高度d影响干扰点的数量和间距，随着容器壁厚t的增加，射流受干扰的程度会加剧。76671

毕业论文关键词 有限元分析 聚能射流 冲击 密闭单元 液体 结构 尺寸 汇聚 干扰

毕业设计说明书外文摘要

Title The movement of the liquid in airtight element structure  while shocked by the shaped charge jet

Abstract

The finite element code LS-DYNA was used to numerically simulate the process of shaped charge jet vertically penetrating the liquid element with different structure type and size in airtight structure, and then analyze the movement of the liquid。 The element have shape with cylinder, hexagonal prism and cuboid while the size being pided with inner diameter d, the vessel wall thickness t, and the height of the element h。 The result showed that the inner diameter and the lumen height will affect the location and the extending direction of the radial imploding liquid, there will be 2 convergence points when h>d, conversely, there will be only 1 point; when d>30mm, the convergence process will extend from the bottom to up, and extend from top to bottom instead; the vessel wall thickness will affect the intensity of radial imploding liquid, with the thickness’s increasing, the intensity will be more stronger and the influence coefficient of the t will decline。 With the increasing of d, the range of the shaped charge jet’s axial velocity will fall behind; the h will affect the number and the location of the interference points; with the increasing of t, the interference level will be higher。   

Keywords  finite element analysis  shaped charge jet  shocked  airtight element  liquid structure   size  radical convergence   interference

目  次

1  引言 1

2  数值仿真方案 4

2。1  仿真软件介绍 4

2。2  物理模型 4

2。3  仿真方案统计 7

3  不同单元高度下密闭容腔壳体内液体的运动情况分析 14

3。1不同单元高度下密闭容腔壳体内液体的运动情况分析 14

3。2  不同内腔高度下射流受干扰情况分析 17

4  密闭容器壁厚对液体运动情况的影响分析 20

4。1 密闭容器壁厚对液体运动情况的影响分析 20

4。2  不同容器壁厚下射流受干扰情况分析