炮膛内底排装置燃烧特性计算分析

为了研究内弹道过程中底排装置的燃烧特性,基于两组不同底排药剂试样装填密度下的密闭爆发器燃烧试验数据,优化计算得到了高压工况下某底排药剂燃速模型为de/dt=8.51×10-8p0.579.建立了底排装置膛内燃烧模型与火炮-底部排气弹内弹道零维模型.针对某155 mm底排装置,在理想发射环境下,计算分析表明:膛内底排装置...

Calculation and Analysis on the Combustion Characteristics of a Base Bleed Unit in the Gun Bore

To research the combustion characteristics of base bleed unit in the interior ballistic process,a high pressure burning rate model of base bleed propellant described as de/dt=8.51×10-8p0.579 was obtained by utilizing an optimization method based on two sets of closed bomb experimental data with different loading density.Both the general combustion model of base bleed unit in bore and 0-D interior ballistic model of gun-base bleed projectile were established.For a 155mm base bleed unit,the research results obtained under an ideal firing condition are as follows: the difference between the pressures in the base bleed unit and under the projectile base is subjected to an increasing-decreasing-balancing-increasing-decreasing history;the mass of inflow is approximately equal to the outflow at the unit exit;the calculated burning mass of base bleed propellant is about 8.22 g;the maximum change of the muzzle velocity caused by the ignition-combustion delay time is less than 0.4 m/s which could be ignored;the burning mass of base bleed propellant is reduced exponentially with the increase in delay time.The results provide the basic data for analyzing the range dispersion caused by the mass deviation of the propellant from the gun muzzle.