Ballistic Simulation And Optimization Of Charge With Controllable Interior Ballstic Parameters

Improving the muzzle velocity of projectile based on the restriction of the maximum bore pressure is the interior ballistic devisers' goal all the time. Different ways of improving the muzzle velocity of projectile are analyzed first in this thesis, then started with charge structue technology, part charge parameters are optimized with optimization theory, the muzzle velocity are maximum improved in the restriction of maximum bore pressure, so lower overload Launching is realized. The main parts are concluded as follows:a) A one dimension two-phase flow interior ballistic mathematical model of a large caliber gun with base igniter is established and its numerical simulation are conducted. The muzzle velocity of projectile, the maximum bore pressure and distribution law of the variables in bore are given. The numerical results are in good accordance with the experimental ones.b) A model of one dimension two-phase flow of two-layered variable-burning rate propellant charge are established and its numerical simulations are conducted. The interior ballistic cycle in the gun are simulated, the muzzle velocity of projectile and the maximum bore pressure are given, the vraiables' change law of different phases are analyzed. A good progressive combustion of two-layered variable-burning rate propellant is aprroved acordding to the caculation results.c) A model of charging optimization which based on the model of one dimension two-phase flow is established. The proper design variables, constraint conditions and objective function are determined. The charge conditions of two-layered variable-burning rate propellant are optimized with optimization theory. Constraint conditions are dealed with exterior penalty function method, so optimization problem that having restrictions is translated into no restriction optimization problem, which is caculated with the Powell's direction acceleration method. Inside and outside layer's burning rate coefficient and thickness of two-layered propellant are optimal matching, and the best excellent muzzle velocity is figured out.