多层管状发射药燃烧性能的数值计算

为了模拟和改善层状发射药的内弹道性能和燃烧性能,建立了一种多层管状发射药的燃烧模型.在服从几何燃烧定律条件下,通过多层管状发射药的形状函数推导出其Γ-Ψ表达式.用Γ-Ψ曲线研究了多层管状发射药的缓燃层厚度与药片初始总厚度比、内外层的燃速比以及药柱厚度与药柱长度之比对其燃烧性能的影响.结果表明,(1)多层管状发射药缓燃层...

Numerical Calculation of Combustion Property for Multilayer Tubular Propellant

The combustion model of multilayer tubular propellant was established to simulate and improve its interior ballistic property and burning behavior.And under the precondition of following the geometric combustion law,the equations describing Γ-Ψ relation of multilayer tubular propellants were derived by using their shape functions.The influences of ratio of the thickness of the slow layer to initial thickness,the burning rate ratio of the fast layer to slow layer,and the ratio of the thickness of propellant to the length of propellant on combustion property of multilayer tubular propellants were discussed through Γ-Ψ curves.The results show that:(1)the thickness of the slow layer to initial thickness of multilayer tubular propellants can′t be too big,and it is better in 0.3-0.6;(2)when the burning rate ratio of the fast layer to slow layer of multilayer tubular propellants is bigger,its combustion progressive property is better;(3)when good progressive combustion property is ensured,the length-to-diameter ratio should value in 2.5∶1-5∶1 to improve its loading density.