A COMPUTATIONAL FLUID DYNAMICS STUDY OF FLOW CONTROL ON AN INFANTRY GRENADE

摘要

A computational study was undertaken to consider the aerodynamic effect of tiny jets as a means to provide the control authority needed to maneuver a projectile at low subsonic speeds. Scalable Navier-Stokes computational techniques have been used to obtain numerical solutions for the jet-interaction flow fields at 0°and 4°angle of attack for both steady and unsteady jets. Numerical results show the effect of the jet locations and sizes on the flow field and surface pressures, and hence on the aerodynamic coefficients. Unsteady jet results have been obtained for a two-dimensional (2-D) jet flow and compared with experimental data for validation. Some results obtained with an unsteady jet for the subsonic projectile are included. These numerical results are being assessed to determine if tiny jets can be used to provide the control authority needed for maneuvering munitions.