侵蚀燃烧在发射装药内弹道中的应用研究

Application Research of Erosive Burn in Propellant Charge Interior Ballistics

侵蚀燃烧是具有内孔燃烧火药的一种普遍现象,应用侵蚀燃烧可改变火药燃烧的规律。由于火炮发射装药装填密度的变化,不同装填密度发射药所受的内孔与外部压力也不同,这种压力差使发射药内孔在火炮膛内燃烧时发生侵蚀燃烧。利用发射药内孔燃气流动的流速、传热和冲刷对燃速的影响,研究了火炮发射装药的侵蚀燃烧对发射药燃速的影响,建立了发射装药侵蚀燃烧数学模型,分析了发射药装填密度、内孔的孔径、药粒长度等变化所引起的侵蚀燃烧变化及对发射装药内弹道性能的影响。提出了在变装药中,利用侵蚀燃烧提高小装药量、小射程用发射装药膛压的方法。

The actual combustion law of the gunpowder with inner holes can be changed by the erosive burning which is an universal burning phenomenon of the gunpowder. The pressure difference between the inner and the outer of gunpowder holes caused by the loading density variation of propellant charge makes the erosive burning occur at the inner holes during in-bore burning. The effect of the erosive burning on the burning speed for the propellant was studied by the factors of flow rate, heat transfer and erosion of the combustion gas. The mathematic model of erosive burning of the propellant was established. The effect of the factors such as loading density, hole size and grain length on the erosive burning and interior ballistics performance was analysed. The method improved the bore pressure for small charge mass and small firing range by the erosive burning was proposed.