Study of Soderholm Erosive Burning Model in Internal Ballistic Analysis of Solid Rocket Motors

Abstract

In this study, the Saderholm erosive burning model is presented as a comprehensive model. Types of propellant (double-based or composite), the need for experimental coefficient for each engine, are the most important limitations of erosive burning models. These require a lot of propellant characteristics and also limitations on the application of some models for high length-to-hydraulic Diameter ratios motors (over 40). In this study, it has been shown that the Saderholm erosive burning model simulates the internal ballistics behavior of a solid propellant engine with an acceptable approximation. Two types of engines with different propellant and length-to-hydraulic Diameter ratios about 30 and 40, the quasi-one dimensional quasi-steady ballistics is solved by using generalized flow equations based on the Saderholm and Greatrix erosive burning models. Finally, it was demonstrated that the Saderholm model is comprehensive for design and numerical work (where there is not much propellant coefficient) and simulates the behavior of the engine with very good approximation.