Abstract:The inaccuracy on the unguided rockets impact can be caused by many factors, like initial conditions perturbations as a small displacement of the firing pods between two launches due to its oscillations. As a consequence, all those parameters have to be taken into account in order to obtain an efficacy firing. This paper will focus on the unguided rocket effectiveness. Using the physical model for the trajectory, we will study the accuracy of the unguided rocket through a statistical analysis and several target models.
This paper proposes a method of determining the “real” combustion law based on numerical simulation that also takes into account the thermal transfer between the hot gases resulting from deflagration and the walls of the vessel. This method is validated using the experimental results obtained in the closed vessel for SB propellant type, used in small-caliber propulsion systems. The proposed method is implemented using Ansys Fluent software, having as input the properties of the closed vessel walls from technical literature and of the gases resulting from the deflagration of propellant, calculated using a thermochemical model. To simulate the burning phenomena of the propellant charge and the impact that may occur between the propellants elements, on the one hand, and between the propellants element and the inner walls of the vessel, on the other hand, we used a dynamic mesh and mathematical models using UDF. For validation we used the diagrams from experimental tests made in the closed vessel at two different loading densities, the results obtained being in good agreement with the experimental ones. Moreover, the method used allows us to evaluate the error due to not taking into account the thermal losses that occurred in the closed vessel.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.