GIBR叠层方片形发射药的燃烧特征

Combustion Characteristics of GIBR Layered Square Flake Gun Propellant

为了研究具有燃速渐增特性和分层结构的方片状发射药的燃烧特性,提出了该药的燃烧物理模型,以此模型建立了相应的形状函数,并对不同外层比例X1、燃速系数比K、药片厚度与宽度之比β条件下相对已燃质量Ψ、相对表面积σ随相对已燃厚度Z的变化进行计算和分析.通过射击试验和中止燃烧试验,对理论计算结果进行验证.结果表明,通过调整内外层比例、药型尺寸和燃速系数比,可以有效地控制分层结构片状发射药在不同时期的气体生成速率,而且实际燃烧规律与理论模型预测的结果基本一致,因此该物理模型基本反映了该种发射药的实际燃烧规律.

In order to study the progressivity of GIBR （gradual increasing burning rate） layered propellant with square flake shape, the physical model about the combustion process was put forward, and the shape function was calculated according to the physical model and the parallel layer burning law. The change of Ψ, σ with Z was calculated and analyzed at different parameters such as X1, K and β. The result by theoretic study was validated by interrupted burning method both in gun chamber and closed bomb. The results show that the gas generating rate of the layered propeUant can be controlled by adjusting the burning rate, dimension and thickness ratio of outer-layer to inner-layer. The results also show that the factual combustion law and theoretic model are consistent and the combustion process approximately reflects the parallel layer burning law.