七孔变燃速发射药燃烧性能的数值计算

Numerical Calculation of Combustion Property for Seven-hole Variable Burning Rate Gun Propellant

为模拟七孔变燃速发射药的燃烧性能,建立了七孔变燃速发射药的燃烧模型。在几何燃烧定律的基础上推导出燃气生成猛度Γ和已燃发射药百分数Ψ的函数关系。通过编程计算得到Γ-Ψ曲线。分析了燃速比、速燃层内孔径、长径比和缓燃层厚度与燃速层厚度之比对七孔变燃速发射药燃烧渐增性的影响。结果表明：速燃层和缓燃层的燃速比为1.5-2.5,长径比为2-3,缓燃层厚度与速燃层厚度之比为0.1-0.22,速燃层内孔径为0.2-0.3mm的七孔变燃速发射药有较好的燃烧渐增性。

To simulate the combustion property of seven-hole variable burning rate gun propellant,a combustion model of seven-hole variable burning rate gun propellant was established.On the basis of the geometric combustion law,the function relation of combustion gas generation brisance（Γ）against the percentage of gun propellant burned（Ψ）was deduced.TheΓ-Ψ curves were obtained by programming and calculation.The effects of burning rate ratio,inner pore diameter of the fast burning layer,length-to-diameter ratio and thickness of the slow burning layer on the combustion progressive property of seven-hole variable burning rate gun propellant were analyzed.Results show that the seven-hole variable burning rate gun propellant under the following conditions has better combustion progressive property：the burning rate ratio of the fast burning layer to slow burning layer in 1.5-2.5,length-to-diameter ratio ranging from2 to 3,the thickness ratio of slow burning layer and fast burning layer in the range of 0.1-0.22,and the inner pore diameter of the fast buruing layer ranging from0.2 mm to 0.3 mm.