Three-dimensional Design And Simulation Of Combustion Surface For Solid Rocket Motor Grain

The grain design is an important part of solid rocket motor design.In this paper,research is carried out on the design modeling of three-dimensional grain,grain surface dispersing,and coupling calculation method of one-dimensional inner trajectory and combustion surface transition,and completes the corresponding program development.First,use a secondary development platform tool based on NX called SNAP(Simple NX Application Programming)and another tool named Block UI Styler to design a NX-style grain design program.This program has the function of parameterdriven visual modeling for common grains and the read-in function of customized models for uncommon grains.And it also supports the dispersion of grain surface,propellant performance parameters design,and engine size parameters design.The dispersing method of the grain surfaces adopts the intersection between a ray and grain surface with ray-swing rotation.The method is applicable to any grain of non-slotted single-channel type and non-slotted solid type,and has good universality.Then,according to the geometrical combustion law of the grain,the combustion surface transition calculation program coupled the one-dimensional internal trajectory is written in C ++.The program can read the discrete files of grain from the design program,and manages the discrete point information of the grain to interweave into a network data structure based on the linked list as the basic structure,and matches the corresponding area calculation.When the elapsed time step is specified,iterative calculations can be performed.And during this process,the program can identify and handle where the points are singular,where the points are too dense or too sparse,and where the faces meet to avoid calculation distortion.The research result in this paper has good universality and is suitable for nonslotted single-channel grain,and non-slotted solid grain of any type.It can greatly save the grain design work and improve design efficiency.After a large number of examples and experimental comparisons,this method has the advantages of high accuracy and fast speed.,can accurately predict the actual combustion of the grain,and has great practical engineering application value.