Research on a burning surface transition method of solid rocket motor grain design

Abstract

Solid rocket motor grain design was one of the cores of solid rocket motor design. To find a universal burning surface transition calculation method for complex three-dimensional grains of arbitrary shapes had important engineering application value. This paper used the UG NX secondary development platform tool SNAP and Block UIStyler to write the dialog program to design and model grain, and used the method for intersection by ray swing and rotating(IRSR) to discretize the grain surfaces. Then used C++ to write a calculation program for the grain combustion surfaces transition in accordance with the geometrical combustion law and coupled with the one-dimensional internal trajectory to obtain the internal flow field parameters during the whole combustion process. The calculation program manages the discrete point information of the grain to interweave into a network data structure based on the linked list as the basic, and took the corresponding area calculation. And during this calculation process which the elapsed time step was specified in, the program could identify and handle where the points were singular, where the points were too dense or too sparse, and where the faces meet to avoid calculation distortion. The results show that this method base on combustion surface transition can accurately capture the complex topology changes during the combustion process. And it is in good agreement with the actual situation and is suitable for non-slotted flat-end single-channel grain or solid grain.