Abstract:
The use of unextractable forming tool (UFT) can significantly reduce the cost of producing expensive removable rig, shortens the solid rocket motor manufacturing cycle and increases production safety. It is proposed to use porous plates made of titanium powders using additive technologies and impregnated with a fast-burning composition based on aluminum borides as UFTs. The paper provides an assessment of the development of the intra-ballistic process in a solid rocket motor with a channel-slot grain, the slot region of which is occupied by UFT. For the assessment, a mathematical model was used that takes into account the initial localization of the ignition point of the UFT-grain, the gradual burnout of the UFT-grain, the gradual ignition of the motor grain as the working surface becomes exposed, as well as the different thermophysical nature of the combustion products of the UFT composition and the main grain. The dependence of the pressure in the combustion chamber, the thrust and the operating time, which significantly depend on the dynamics of the development of the burning surface of the grain, are determined by the combustion rate of the UFT material.
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