| Application of level set method in solid propellant grain burnback with dogbone grain as a case study |
| Paper ID : 1062-ASAT19-FULL (R2) |
| Authors: |
|
Hossam El-Din Adel1, Hatem Belal *2 1Rockets Department, Military Technical College. 2Egyptian Armed Forces |
| Abstract: |
| Solid propellant grain burnback is a crucial step internal ballistic module. There are different methods to predict grain burnback; the oldest method is the drafting technique where the burning surface is tracked using manual drawing applying surface regression rules, then there is the analytical method, where a geometric analysis of the surface is performed and analytical expressions for the burning surface segments are derived, these expressions are evaluated at different values of burnt distance to find the evolution of burning surface and port areas with time. Level set method is a different approach which in some aspects it may be considered a drafting technique where the burning surface segments are tracked, from another point of view it is a numerical method that track the burning surface with no need of trying to derive analytical expressions for burning rate segments. Dogbone grain is known for its structural superiority; however, the researches dealing with dogbone grain design parameters are scarce. In this paper, level set method is introduced with the main steps are elaborated. A validation of level set method is performed against drafting technique using CAD and analytical expression for the well-known star grain. Finally, dogbone grain geometry with different configuration is introduced, and a parametric study for the governing parameters that affecting dogbone grain burnback is performed. |
| Keywords: |
| Solid Propellant, Grain Burnback, level set method, drafting technique, Internal Ballistics, Dogbone grain, Star grain |
| Status : Paper Accepted (Oral Presentation) |
