AP/HTPB复合底排推进剂初温对弹丸落点散布的影响

Scatter of Projectile Affected by Initial Temperature of AP/HTPB Composite Base Bleed Propellant

为了定量分析AP/HTPB复合底排推进剂初温对弹丸落点散布的影响,引入了AP/HTPB复合底排推进剂燃速初温敏感因子(σp)。鉴于AP颗粒对底排推进剂燃速起主导作用,计算分析了Glick、Kubota及BDP三种模型AP颗粒初温敏感因子模型的结果。底排装置内工作压力接近0.1MPa且变化不大,故取常值σp=0.43%/K。针对某155mm底排弹,通过建立其内弹道及6D外弹道模型并联立求解,计算了底排推进剂初温对弹丸落点散布的影响,发现射程对温度的敏感因子约为8.22m·K-1,侧偏对温度的敏感因子约为0.447m·K-1,射程随初温的变化率与文献值比较接近,误差为12%。

In order to study the effects of the initial temperature of AP/HTPB（ammonium perchlorate/hydroyl-terminated polybutadiene）composite base bleed propellant on the hitting points of the projectile scatter quantitatively,the initial temperature sensitivity factor（σp）of burning rate for AP particles was introduced,and calculated by three models,Glick,Kubota and BDP considering that the burning rate of AP was dominate in base bleed propellant.Based on the calculatedσp,the internal ballistic model and 6D external ballistic model for a 155 mm base bleed projectile were built and solved simultaneously to simulate the hitting points of the projectile scatter.Results show thatσp=0.43%/K obtained from model BDP is appropriate owing that the inner pressure of base bleed unit is close to 0.1 MPa and changes little.The sensitivity factor for the range and cornering of the projectile affected by the initial temperature of AP/HTPB propellant are 8.22 m·K^-1 and 0.477 m·K^-1,respectively,and the calculated range changing with initial temperature is very close to that from literature with the error of 12%.