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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Numerical Aerodynamic Simulation of an Artillery Projectile with a Base Bleed System
Submission Author:
Rachel Manhães de Lucena , RJ
Co-Authors:
Rachel Manhães de Lucena, Norberto Mangiavacchi, José da Rocha Miranda Pontes, Daniel Chalhub, GIL ROBERTO VIEIRA. PINHEIRO, Wallace Ramos Rosendo da Silva, Leib Neubarth, Maurício Ferrapontoff Lemos, LAURILIO SILVA JUNIOR
Presenter: Rachel Manhães de Lucena
doi://10.26678/ABCM.ENCIT2020.CIT20-0617
Abstract
A flying object such as a munition projectile has a limited range in part due to aerodynamic drag. One way to increase rear pressure is through the insertion of the combustion products generated by the burning of a propellant, by the so called Base Bleed system. A munition with a Base Bleed system is normally called as an ``extended range” munition. There are no models or commercially available software to be used to predict a specific propellant formulation which will deliver the desired performance - the only way is through a real test in a shooting range, which demands a costly logistics and great risks. In this work, we investigate the supersonic flow around an artillery projectile to relate the influence of the base bleed system on the drag coefficient using CFD. We consider a supersonic airflow on two-dimensional axisymmetric domain and we solve the governing equations by OpenFOAM software. After the tests, we found/confirm that there is an optimum value for the velocity of the escape of gases from the base bleed unit which produces the larger drag reduction.
Keywords
artillery munition, base pressure, base bleed, drag coefficient, CFD
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