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7. Numerical simulation research of inner ballistic overload of guided projectile based on coated mixed charge

Author

Ji Guofeng, Tu Xinxin, Nan Fengqiang, Liu Qiong, and Du Ping

Subjects
coated mixed charge, guided projectile, launch overload, in-chamber combustion, numerical simulation, Information technology, T58.5-58.64
Abstract

In order to study the numerical variation law of the internal ballistic overload of the guided projectile under different coated mixed charge structures, and to provide a basis for the development of a new type of high muzzle velocity and low overload propellant charge design, taking a large-caliber suppressed artillery as the simulation object, the layered combustion model of the coated propellant was established by using the one-dimensional two-phase flow theory, and the lace 37-hole nitroguanidine propellant was used as the main charge (MC) and lace 19-hole nitroguanidine coated propellant as auxiliary charge (B). The effects of mixed charges with different charge mass, different mixing ratios and different coating layer thicknesses on the internal ballistic overload value were studied by simulation calculation. The research results show that the increase of the total charge mass will increase the overload impact of the guided projectile and the muzzle velocity of the projectile ; with the increase of the thickness of the coating layer and the proportion of the coated propellant in the mixed charge ratios, the longitudinal overload and the muzzle velocity of the projectile in the chamber of the guided projectile will be decreased to a certain extent and the time point when the maximum overload occurs will be delayed; under the structure of the coated mixed charge, the influence of the proportion of coated propellant in different mixed charge ratios and the coating layer thickness of coated propellant on the launch overload of the guided projectile is greater than the muzzle velocity of the projectile, and the effect of reducing the firing overload in the chamber by increasing the proportion of coated propellant in different mixed charge ratios is the most significant.

Published
2022
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14. Research on the Combustion Performance of Mixed Charge of the Super-porous Coated Propellant

Author

Cao Xiang, Du Ping, Zhang Lina, Jiang Shuai, and Nan Fengqiang

Subjects
Propellant, History, animal structures, Materials science, musculoskeletal, neural, and ocular physiology, technology, industry, and agriculture, Charge (physics), macromolecular substances, Combustion, Computer Science Applications, Education, body regions, Chemical engineering, Porosity
Abstract

In order to study the constant volume combustion performance of the mixed charge of super-porous propellant and super-porous coated propellant, 37-hole nitroguanidine propellant and 37-hole nitroguanidine coated propellant containing flame retardant TiO2 were prepared. At high temperature(50°C), normal temperature(20°C), low temperature(-40°C), a constant volume combustion experiment was performed on a mixed charge with a mass ratio of 1: 1 for the 37-hole propellant and the 37-hole coated propellant. The research results show that the constant volume combustion performance of the mixed charge is different from a single coated propellant and a single base propellant. The p-t, dp/dt-t and L-B curves of the mixed charge were between the coated propellant and the base propellant, but mixed charge has the greatest progressive combustion. And the temperature dependence of the progressive combustion of mixed charge is small, which has a certain low temperature effect.

Published
2020

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