底部排气弹排气药剂燃速及点火具工作时间的确定

DETERMINATION OF BURNING RATE OF THE BLEED PROPELLANT AND IGNITION TIME OF THE IGNITER IN BASE BLEED PROJECTILES

本文提出了减阻率冲量的概念;阐述了燃速的选择原则:在弹丸发射参数一定的条件下,考虑弹丸旋转效应的影响,获得最大增程率,也即是获得最大减阻率冲量时的燃速;给出了燃速的确定方法。本文提出了确定点火具工作时间的两条原则:一是点火具工作时间不小于底排药剂二次点火时间;二是底排药剂的二次点火距离散布不影响总距离散布。在此基础上,导出了确定点火具工作时间的公式。利用本文的公式进行分析和设计,证明是有效的。

This paper presents the concept of impulse of reduced drag rate. The principle of burning rate selection is to achieve a maximum in the extended rate, with given launch parameters of the projectile and when the spinning effect of the projectile is taken into consideration, stated otherwise, to reach the burning rate when the maximum impulse of reduceddrag rate is obtained. This will be defined as the optimum condition. The method of determination of burning rate is then given.This paper gives two priciples for the determination of the ignition time of the igniter:(1)the ignition time of the igniter is no less than the time of second ignition, of the propellant; (2)the range dispersion caused by dispersion of second ignition time does not affect the overall range dispersion of the shots. Based on these, formulas for the determination of the ignition time of the igniter are developed. These formulas have been used in analyses and designs, showing satisfactory results.