Method Research For Burning Surface Calculation Of Solid Rocket Motor With Complicated Grain

The improvement to internal ballistic calculation precision of Solid Rocket Motor(SRM) is important to capture target of missile.and to accomplish it's task. Calculation of burning surface of propellant grain is essential to interinal ballistic performance calculation. Existing calculation methods for burning surface don't well agree with the experimental data with complicated grain. In order to eliminate the error, tests data are used to correct the prefigurative result generally, and it is impossible to calculate burning surface of grain with crack.debond and wtith changing burning rate of propellant. This paper aims at developing a new method that can calculate burning surface of complicated 3D grain and defects grain to improve precision of interinal ballistic performance simulation and grain design level.Level Set method was used in this paper to attain burning surface variety regulation of arbitrary configuration grain by tracing interface of grain surface burnback.The work of this thesis can be summaried as follow:1. This new method has the capability of calculating complicated 3D grain burning surface.dealing with evolving interface of complicated material and topology change (splitting.breaking.merging), based on Level Set method and burning surface process law.This technique can get accurate area of burning surface each moment and data of geometrical structure that provide access to examination of grain change in the SRM working process.2. Burning surface calculation of complicated geometry grain.grain with flaw.grain with changing burning rate or multi-burning rate was performed.The results show that this new method has very high precision, and it provides a helpful method for the quality analysis of grain with defect.3. High order WENO scheme in spatial discretization and 3rd order TVD Runge-Kutta schemes in time stepping were used to time-dependent Hamilton-Jacobi type equation ,in order to improve calculation precision.The resultes show the precision is improved obviously and no oscillation appear.4. The software that can calculate 3D complicated grain was developed. A code based on particularity of grain burnback was optimized to improve efficiency.The software has high calculation precision.convenient and speedy and it has been proved in engineering application.This work can provide a foundation for coupling grain burnback process to SRM chamber flowfield numerical simulation.