埋头弹药二次点火过程复杂流场特性
Complex Flow Field Characteristics inside Combustion Chamber During the Secondary Ignition Process of CTA
郭俊廷 1余永刚1
作者信息
- 1. 南京理工大学能源与动力工程学院,江苏南京 210094
- 折叠
摘要
为研究大口径埋头弹二次点火过程中燃烧室内部的流场特性,采用基于欧拉-欧拉方法的二维轴对称两相反应流模型,结合动态网格划分理论和用户自定义函数技术,对105 mm埋头式穿甲弹的二次点火内弹道过程进行数值模拟.研究结果表明:可燃导向筒破裂后主装药床被点燃,燃气在弹底区域汇聚,形成局部涡流,涡流强度逐渐增大,涡流中心温度逐渐升高;在气相力的作用下,主装药床沿轴向和径向挤压至弹底区域,然后被大量燃气冲散至整个燃烧室;二次点火过程中最大膛底压力为560 MPa,炮口初速达到1 650 m/s.
Abstract
The flow field characteristics inside the combustion chamber during the secondary ignition process of a large caliber cased telescoped ammunition(CTA)is studied.A two-dimensional axisymmetric two-phase reacting flow model based on the Euler-Euler approach is used,combined with dynamic grid division theory and user-defined function technology,to numerically simulate the secondary ignition internal ballistic process of a 105 mm CTA armor-piercing projectile.The results show that the main charge bed is ignited after the rupture of combustible guide tube,and the gas converges in the bottom area of the projectile,forming local eddies.The intensity of the eddies gradually increases,and the temperature at the center of the eddies gradually increases.Under the action of gas phase force,the main charge bed is compressed axially and radially to the bottom area of the projectile,and then is dispersed by a large amount of gas into the entire combustion chamber.It is found that the maximum breech pressure during the secondary ignition process is 560 MPa,and the muzzle velocity reaches 1 650 m/s.
关键词
埋头弹药/两相反应流/内弹道/流场特性/数值模拟Key words
cased telescoped ammunition/two-phase reacting flow/internal ballistics/flow field characteristic/numerical simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据