斜切喷管的120mm迫射增程发动机设计
毕业论文关键词 斜切式喷管 恒燃面 压强 推力
Title the Design of 120mm Extended Range Rocket-propelled Mortar Shell based on Beveling Nozzle
Abstract The conventional ammunition upgrades is now the major trends to better play its power. in order to improve the mortar shell’s property, a mortar can be used rocket to extend range except improve frag demolition power. Thus can adapt to the needs of modern war and play a important role in a broader area. This paper takes 120mm extended-range Mortar as the object of the research. The main contents are beveling nozzle solid propellant and structure design. it integrated uses of zero-dimensional interior ballistics and Mass Point Trajectory .the design of beveling nozzle solid rocket motor mainly based on above knowledge. The work are Solid rocket motor constant burning surface design, Designing the structure and size of the beveling nozzle according to the requirement and Writing Visual Basic calculation and analysis program.by application of internal and external ballistics equations ,we can get chamber pressure , engine thrust , range and velocity varying with time.
Keywords beveling nozzle constant burning surface pressure thrust
目录
1引言.1
1．1迫击炮弹增程.1
1.1.1次口径弹丸增程.1
1.1.2底排/复合火箭增程.1
1．2发动机装药设计..2
1.2.1装药设计基本要求..2
1.2.2恒面性药柱..3
1．3喷管设计..5
1.3.1喷管设计基本要求..5
1.3.2喷管的结构形式.5
1.3.3锥形喷管的型面设计6
1．4本文的主要研究工作.8
2增程方案设计与分析.10
2．1总体指标与要求.10
2．2装药尺寸结构设计与计算..10
2.2.1装药结构分析..10
2.2.2装药燃面设计过程.11
2．3斜切喷管尺寸结构设计与计算.14
2．4本章小结.19
3内弹道计算与分析20
3．1零维内弹道微分方程20
3.1.1装药燃烧阶段内弹道方程.21
3.1.2拖尾段内弹道方程.23
3．2四阶龙格库塔法介绍24
3．3零维内弹道压强计算流程图25
3．4推力计算.26
3．5VB程序内弹道分析与计算..26
3.5.2斜切喷管与普通喷管推力对比与分析29
3.5.3斜切喷管斜切角对推力的影响30
3．6本章小结.30
4质点外弹道计算..31
4．1质心运动基本假设..31
4．2主动段基本方程.31
4．3被动段的近似解法..33
4．4VB程序外弹道分析与计算..34
4.4.1外弹道输入输出参数..34
4.4.2外弹道曲线分析35
4.4.3出炮口速度对外弹道的影响..36
4.4.4射角对外弹道的影响..36