Abstract
Reported here are the time-resolved and ensemble mean and rms fluid velocities obtained by laser Doppler anemometry in a subsonic gun simulator with an inert single-phase flow and a projectile exit velocity of 40 m/s. The results presented also include the time-resolved measurements of the projectile velocity and breech pressure. The results show that, based on measured breech-pressure record, the calculated projectile velocities are almost exactly equal to the measured values and confirm that the friction of the system is negligible. Fluid velocity traces, together with ensemble mean and rms velocity profiles, indicate the presence of a wall boundary layer occupying up to 20% of the tube radius and having a growth rate similar to that of steady turbulent boundary layers. The nature of velocity fluctuations and the shape of velocity profiles inside the boundary layer also suggest that the boundary layers are turbulent in the wake of the projectile.
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