LAUSR

The gaseous cavity resulting from a hydrodynamic ram (HRAM) event in a fluid-filled tank is composed of entrained ambient gases and vaporized local fluid. However, the relative composition during initial cavity formation requires additional research. By measuring and studying the entrained flow through the projectile penetration orifice, calculations to aide in determining the relative composition of entrained gases and vaporized fluid are achieved. Additionally, qualitative assessments on how orifice mass flow correlates with internal cavity dynamics are possible. To complete the measurement, a technique to capture the time-resolved flow field at projectile impact velocities ranging from 100 to 180 m/s is needed. The developed technique utilizes non-invasive diagnostics to include high-speed digital imagery and a continuous wave laser in conjunction with particle image streak analysis to visualize and measure the entrained flow field.Graphical abstract