MacCormack火药内孔点火特性研究
关键词 火药内孔 点火特性 MacCormack格式 气体流动
毕业论文外文摘要
Title A Research On The Ignition Characteristics of The Perforation of Propellants
Abstract
This paper studies the flowing process of ignition gas inside the perforation of propellants like stick propellants and porous propellants and the ignition characteristics of propellants’ stick perforation. A one-dimensional aerodynamic model which shows the flowing of ignition gas inside the perforation is constructed.Meanwhile,a radial one-dimensional unsteady heat transfer model of ignition is constructed considering the convection and radiation heat transfer effect.With the given initial and boundary conditions,numerical calculations of ignition gas’s flowing process are made with MacCormack scheme and numerical calculations of heat transfer process are made with an explicit difference scheme.The results are shown by the graph.The distribution and variation of temperature, velocity and pressure is simulated.At the same time ,the temperature distribution and variation inside the perforation is simulated too.Analyzing the results ,the following conclusions can be obtained.The ignition inside the perforation occurs not at the same time and the ignition sequence is associated with the parameters of propellants.The entrance part may not be the first to be ignited.
Keywords the perforation of propellants Ignition characteristics
MacCormack scheme Gas flow
目 次
1 绪论 1
1.1 点火理论简介 1
1.1.1 固相点火理论 1
1.1.2 气相点火理论 1
1.1.3 非均相点火理论 1
1.2 新型点火技术 1
1.2.1 等离子体点火 1
1.2.2 激光点火 1
1.3 内孔对火药燃烧的影响 2
1.4 本文主要的研究工作 2
2 火药内孔燃气传播模型 3
2.1 基本假设 3
2.2 数学模型 3
2.3 数值计算 4
2.3.1 选择差分格式 4
2.3.2 给定初始条件及边界处理 6
2.4 本章小结 7
3 火药内孔表面温度计算 9
3.1 基本假设 9
3.2 数学模型 9
3.3 数值计算 9
3.3.1 选择差分格式 9