底排装置工作不一致性对射程散布影响的研究

底部排气弹与传统制式弹相比的主要特点是射程远但散布大。影响其射程散布的重要因素之一就是底排装置工作的不一致性。通过建立底部排气弹底排装置内弹道和外弹道计算模型,基于独立随机假设理论,采用数值模拟方法,计算分析了由于点火具点火延迟时间、底排装置工作时间和底排药剂部分脱落造成质量偏差的不一致性对射程散布的影响。得到了平均单位点火延迟时间、底排装置工作时间和质量偏差引起的射程改变量。对于单位点火延迟时间引起的射程改变量630m与试验结果667m吻合较好,故在此基础上的计算模拟结果具有一定的工程应用参考价值。

Research on Range Dispersion of Base Bleed Projectile Caused by Inconsistent Working Characteristics of Base Bleed Unit

The main characteristics of base bleed projectile is longer firing rang but bigger dispersion by comparison with traditional projectile. One of the important factors which affects the range dispersion is the working inconsistency of base bleed unit. Three kinds of inconsistent aspects, including the ignition delay time, the working time of base bleed unit and the much bigger mass deviation of base bleed propellant grain caused by fragment peeling off, were investigated using the mathematic simulation method based on the interior ballistics and exterior ballistics models, and the random hypothesis theory. The values of firing range changed by average per-unit ignition delay time, working time of base bleed unit and mass deviation were obtained. The numerical simulation result ( 630 m) of firing range due to unit ignition delay time was in good agreement with the test result (667 m). The results of study provide an important reference for engineering design.