摘要由常规发射原理可知，膛压峰值过高时不仅对发射器，而且对弹丸的设计都十分不利。当炮膛口径增加时，传统的弹药装填技术便无法解决由口径增大带来的高膛压以及强后坐等问题。弹丸的设计和武器的机动性要求膛压较低，但是在膛压较低时将导致装药点火难以实现。高低压发射原理有利于解决上述基本问题。82755

  高低压发射原理是使火药始终只在相对密闭的高压室内燃烧。达到一定的压力后喷口全部打开，火药燃气从高压室流入低压室中，当低压室的压力达到弹丸挤进压力后启动弹丸，推动弹丸在发射管中加速前进运动。这样便能保证火药在高压室中完全燃烧，保证内弹道性能的稳定性，又能保证低压室中的压力不太高。

  本设计针对高低压发射原理和相关技术特点，建立高低压火炮的内弹道数学模型，并进行编程计算，绘制出一条内弹道曲线。在此基础上，利用该程序进行参数预测分析，讨论高低压室容积、喷孔面积等结构参量及装药量、火药燃速系数、火药力等装填参数的变化对高低压火炮内弹道性能的影响。

毕业论文关键字 高低压 内弹道 双药室 火炮

毕业设计说明书外文摘要

Abstract  By the conventional emission principle, it is known that the peak pressure of the chamber is not good only to the transmitter, but also to the design of the projectile。 When the bore diameter increases, the traditional ammunition loading technology cannot solve these problems,such as the high chamber pressure and strong recoil, produced by diameter increases。 The design of the projectile and the maneuverability of the weapon require the gun pressures are lower, but it is difficult to realize the ignition of the charge when the pressure is low。 The principle of high and low pressure is beneficial to solve the above mentioned basic problems。

  The principle of the high and low pressure emission is that the powder is always burning in a relatively confined high pressure chamber。 After reaching a certain pressure nozzles fully open, the powder gas from a high-pressure chamber into the low pressure chamber, when the low pressure chamber’s pressure reaches the projectile engraving pressure the projectile commissioning, and promote projectile in the launch tube accelerate forward motion。 This will ensure that the powder in the high pressure chamber complete combustion, to ensure the stability of the interior ballistic performance, but also to ensure that the pressure chamber is not too high pressure。

  This design according to the principle of high and low voltage transmission and related technical characteristics, the mathematical model of the interior ballistic of the high and low pressure gun is established, and the programming calculation is carried out。Draw an interior ballistic curve。 Based on this, using the program carry out parameters prediction analysis, to discuss the effects of the change of the low and high pressure chamber volume, the flow area of the nozzle, structure parameters and charge weight, propellant burning rate coefficient, powder force and loading parameters on the interior ballistic performance of the high and low pressure gun。

Keywords：High and low voltage  interior ballistics  double chamber  artillery

主要符号

 1/2火药宽度                         燃气温度

 定容比热                            火药燃烧温度

 定压比热                            火药气体压力冲量

 管状药起始内径                      火药燃烧结束时的压力全冲量