A New Model to Predict Erosive Burning in Solid Rocket Motor

In the present research, a new model is presented to predict the burning rate of a solid rocket motor (SRM) in the presence of erosive burning phenomenon. This model is based on the Wang model and the major modification is adding the pressure change in the erosive burning rate. In addition, the necessary relations needed to calculate the velocity gradient on the propellant surface in a one-dimensional internal ballistics code was presented. To assess the new model, the test results of a laboratory motor designed in this research were used. Also, to compare the performance and accuracy of this model with the other models, this motor was simulated with the presented model and the six available models. The results of the comparison indicate that the new model has better accuracy than the other models. The advantage of introducing the pressure effect in the Wang model has been shown. Another advantage of the new model is that this model doesn’t have any experimental constants dependent on the propellant composition or grain dimensions which is a common defect in popular models such as Lenoir-Robillard model.