MacCormack水下火炮内弹道数值仿真及参数设计
毕业设计说明书中文摘要本文主要研究的是水下火炮内弹道过程。水下炮根据结构分为两种：一种与常规火炮类似，射弹直接与水接触；另一种在炮口处设有挡水板。本文对这两种水下炮内弹道都进行了数值仿真，得到了p-t,p-l,v-t,v-l曲线，并对影响其发射性能的主要参数进行了分析与设计。84175
对第一种水下炮建立零维模型。具体分析了各项力和能量损耗，得到了内弹道基本方程组，并使用四阶龙格-库塔法积分。对第二种水下炮建立了零维模型和一维模型。考虑到射弹超声速后，弹前会产生激波阻力，对弹前阻力做了修正。一维模型中，弹前气体使用MacCormack格式计算，运动边界用控制体守恒公式计算，静止边界处用镜像反射法处理，弹前弹后交替计算。
毕业论文关键词 水下火炮 内弹道 数值仿真 MacCormack格式
毕业设计说明书外文摘要
Title Simulation of Interior Ballistic of Underwater Guns and Parameter Design
Abstract In this paper, we mainly study the interior ballistic process of underwater guns。 Underwater guns are pided into two kinds by structure: one is similar to conventional artillery , and its projectile contact with water directly; another is equipped with a manger in the muzzle。 This paper do the numerical simulation of both of the two kinds underwater guns trajectory, and get p-t, p-l, v-t, v-l curves。 Main parameters that effect on the emission properties were analyzed and designed。
The zero dimensional model is built for the first kind of underwater gun。 By detailed analysis of the force and energy loss, get the ballistic equations, and use the fourth order Runge Kutta integral method to calculate。 Both zero dimensional model and one dimension model were established for the second kind of underwater gun。 Considering the projectile would be supersonic, shock wave would emerge before the projectile。 This paper made some correct for the resistance。 Use MacCormack format to calculate the gas。 Use control volume conservation formula to calculate moving boundary 。 And use the method of mirror reflection to calculate static boundary。 Alternating calculation of projectile before and after were done。
Keywords underwater gun internal ballistic numerical simulation Runge-Kutta method
目 次
1绪论 1
1。1课题背景及意义 1
1。2研究概况 1
1。3本文的主要工作 3
2开口发射水下火炮零维模型建立 4
2。1内弹道过程分析 4
2。2基本假设及数学模型 4
2。3数值计算方法 7
2。4初边值条件 8
2。5本章小结 9
3闭口发射水下火炮零维模型建立 10
3。1内弹道过程分析 10
3。2基本假设及数学模型 10
3。3本章小结 12
4闭口发射水下火炮一维模型建立 13
4。1引言 13
4。2基本假设及数学模型