Численное моделирование картин обтекания модифицированных пуль при дозвуковых скоростях полета

Abstract

The purpose of the study was to carry out a numerical simulation in a special package of the subsonic air flow around a pneumatic bullet of various modifications, the latter being previously experimentally tested on the ballistic track of the Department of Dynamics and Flight Control of Rockets and Spacecraft at Bauman Moscow State Technical University. The paper briefly analyzes the applicability of the most common computing packages for solving the problem, justifies the use of the ANSYS CFX package, describes the requirements and features of the computational grid construction, and gives the boundary conditions. The verification problem was solved, which showed good correspondence of the constructed model to the results of field shooting carried out in previous studies. The influence of the longitudinal rotation of the reference model of the bullet on the pattern of its flow and aerodynamic characteristics were investigated. The results of the calculations confirmed the drag improvement and bullet dispersion effects obtained when testing a number of modified samples. The calculated flow patterns and pressure fields contributed to a complete understanding of the physics of the studied modifications in a wide range of flight speeds.