Computer Code for Thermal Analysis of Rocket Motors

Abstract

Further development of a two-dimensional thermal analysis code (G2DHeat) to include internal decomposition and charring ablation of insulation materials is presented. An overview of the structural changes made to the program code by implementing an implicit solution routine, including source term is given, before testing and verification of accuracy is performed. A kinetic model for decomposition reactions, as well as routines for handling the generated gas from the decomposition reactions, changes concerning the material properties and erosion of surface material are implemented and explained. Comparisons of results are made with similar results obtained by commercial programs. Possible reasons affecting the results are pointed out, before additional comparisons with experimentally observed measurements are performed. Based on the simulated results it is concluded that a great deal of testing remains for proper validation of the program. How to include better boundary conditions for simulating charring ablation is suggested and recommended for further development of the program.