Influence of Propellant Type on the Low-temperature Chamber Pressure at Large Firing Angle
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摘要:针对某型迫弹发射装药在大射角条件下低温内弹道膛压超标的问题，基于不同药型发射药的制造工艺和大射角条件下的低温燃烧规律，研究了基本药管内装不同药型发射药对内弹道性能的影响，并进行内弹道性能试验验证和适配性试验验证。结果表明：在大射角条件下，基本药管内装球扁形双基发射药在点火过程中发生低温脆裂，导致发射装药燃烧不稳定，膛压超标；而基本药管内装方片形双基发射药低温燃烧稳定，内弹道性能满足指标要求。迫弹发射装药基本药管采用方片形双基发射药不仅解决了大射角试验条件下低温内弹道膛压超标的问题，还提高了发射装药结构的本质安全性。
Abstract:Based on the excessive low-temperature interior ballistic chamber pressure of mortar bomb at large firing angle, the influence of different types of propellants in the ignition cartridge on the interior ballistic performance was studied, from the aspects of manufacturing technology and low-temperature combustion law at large firing angle. And the interior ballistic performance test and the adaptability test were carried out. The results show that the oblate double-base propellant in the ignition cartridge fractures during the ignition process, resulting in unstable combustion of propellant charge and excessive chamber pressure at large firing angle; however, the square double-base propellant burns stably at low temperature and the interior ballistic performance meets the index requirements. Therefore, the ignition cartridge of mortar bomb propellant charge adopts the square double-base propellant, which not only solves the failure of excessive low-temperature interior ballistic chamber pressure at large firing angle, but also improves the intrinsic safety of the propellant charge structure.
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