Master thesis and internship[BR]- Master's thesis : Numerical analysis of a one-stage light gas gun in order to correlate the muzzle velocity[BR]- Integration Internship : Safran Aero Booster

Abstract

This master thesis presents a comprehensive numerical analysis of a one-stage light gas gun to establish correlations between muzzle velocity and various parameters. The study encompasses the historical evolution of compressed air machines, introduces analytical one-dimensional models, and applies them to the context of a bird gun. These models form the basis for predicting muzzle velocities for different masses.

In the pursuit of accuracy, Computational Fluid Dynamics (CFD) URANS simulations were conducted using Ansys Fluent with the Finite Volume Method and the k-epsilon closure model. The simulations were compared against the results derived from the analytical 1D models. The focus of the investigation was to ascertain the impact of factors such as entropy generation, turbulent kinetic energy production, friction, pressure, and wave drag on the resulting differences between the two sets of results.

The computed pressure profiles required to achieve specific outlet velocities for varying masses are presented. Remarkably, the CFD results exhibit a favorable correlation with the predictions obtained from the 1D models. Discrepancies are attributed to the effects of entropy generation and turbulent kinetic energy, along with considerations of friction, pressure, and wave drag.

This study underscores the effectiveness of combining analytical 1D models with advanced CFD simulations to provide valuable insights into the behavior of the one-stage light gas gun. The findings contribute to a deeper understanding of the underlying dynamics and performance factors governing the gun operation.