Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical and experimental analysis of rotating blunt bodies trajectory at sea-level conditions.
Submission Author:
Geovanna Borges , DF
Co-Authors:
Geovanna Borges , Olexiy Shynkarenko, Patrick Christian de Melo, Washington Siqueira da Macena, Gibran Cavalcante Alves Silva
Presenter: Geovanna Borges
doi://10.26678/ABCM.COBEM2023.COB2023-1906
Abstract
The current study presents a numerical and experimental investigation of a rotating blunt body trajectory at sea-level conditions. The research aims to investigate the movement of a rotating blunt body along its trajectory and focuses primarily on objects with axial rotation. The study is essential since its results could be applied in various areas of external ballistics applied to trajectory analysis of small self-stabilizing rockets, bullets, and reentry objects. There are very few publications in the literature about the subject, making this study significant. To achieve the research goal, numerical and experimental methods were employed. The numerical analysis was based on the solution of the Navier-Stokes equations. Two approaches were explored - bi- and three-dimensional simulations of compressible flow. 2D simulations were made using classical axisymmetric and swirling models. A 3D approach was used to confirm the 2D simulation and analyze lateral forces due to side wind. Four geometrical shapes were studied numerically, and the drag and lift coefficients were calculated as functions of Mach number. The trajectory equation uses numerically calculated aerodynamic coefficients to obtain the path of the blunt body. The program can provide both direct and reverse calculations for trajectory recovery. Compared to other models in the literature, the current model's main advantage is that it can work with a wide range of input angles and velocities. The experimental study served to validate numerical simulations. It is based on measuring trajectory parameters, including the initial body angle, final angle, average velocity, and wind velocity. The experiments were conducted to obtain the data for trajectory recovery and confirm the numerical results. The current research results provide a versatile trajectory model built and validated with experimental data. The 2D and 3D simulations provided reliable information about the aerodynamic coefficients. Future works will focus on a vast validation of the numerical results by experiments in a wide range of test conditions.
Keywords
Blunt body, 2D simulations, trajectory estimation, Navier-Stokes Equations
