弧厚偏差对发射药燃烧残渣形成的影响

为研究弧厚尺寸偏差对发射药燃烧残渣形成的影响规律,采用螺旋测微仪量取球扁形发射药弧厚值,并经统计分析得到发射药的弧厚分布规律。利用混合装药形状函数的形式,将弧厚分布规律转化为装药形状函数,再结合经典内弹道模型,模拟研究发射药弧厚偏差与燃烧残渣之间的关系。结果表明:发射药弧厚存在偏差,弧厚值呈正态函数分布,弧厚较大的发射药难以在膛内燃尽将形成燃烧残渣。其中,研究采用的球扁形发射药弧厚偏差为0.10 mm,射击时将有0.2%的发射药不能燃尽形成燃烧残渣;弧厚偏差Δ0.02 mm或期望值μ≥0.29 mm时,射击时会有部分发射药不能燃尽而形成燃烧残渣,并且随着弧厚偏差的增大或期望值的提高,燃烧残渣量增加。

Effects of Propellant Web Size on the Formation of Combustion Residue

To study the forming regularity of combustion residue caused by the deviation of web size of gun propellant, the web size of oblate propellant was measured by a spiral micrometer and the distribution rule of web size was obtained by statistical analysis. Using propellant form function of composite charge, the distribution rule of web size was converted to propellant form function, and then the relationship between distribution of web size and combustion residue was investigated based on the classical interior ballistic models. Results show that the deviation of web size exists in gun propellant, and the distribution rule of web size conforms to normal probability function. The propellant with large web size can not be burned out in chamber and form combustion residue. The deviation value of web size of oblate propellant is 0.10 mm, and 0.2% of the propellant charge will become combustion residue when firing. When the deviation value of web size over 0.02 mm or expected value greater than or equal to 0.29 mm, part of the propellant charge will change to combustion residue, and the amounts of residue increases with the increasing of expected value or deviation of web size of propellant.