Accession Number : ADA309170

Title :   Flow Visualization of Steady and Transient Combustion in a 12O-mm Ram Accelerator.

Descriptive Note : Final rept. Jan 94-Mar 95,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kruczynski, D. ; Liberatore, F. ; Hewitt, J. ; Kiwan, M.

PDF Url : ADA309170

Report Date : APR 1996

Pagination or Media Count : 40

Abstract : A technique to visualize transient and steady combustion phenomena in ram accelerators using sacrificial transparent acrylic chambers is demonstrated. This technique allows the normal operating environment of ram accelerators to be very closely approximated. Using this technique, details of the environment during the transient starting phase as the projectile enters the accelerator and the obtrurator is discarded are seen for the first time. In addition, steady or running combustion around the projectile after the obtrurator has been shed is captured. These flow visualizations are shown to be useful in validating computational fluid dynamics codes and in providing guidance in reducing projectile unstarts while increasing initial accelerator performance.

Descriptors :   *FLOW VISUALIZATION, *HYPERVELOCITY GUNS, TRANSIENTS, ACCELERATION, GUN LAUNCHERS, COMPUTATIONAL FLUID DYNAMICS, GAS DYNAMICS, COMBUSTION CHAMBERS, SUPERSONIC COMBUSTION, GAS CHROMATOGRAPHY, GUN PROPELLANTS, INTERIOR BALLISTICS, STEADY FLOW, SUBSONIC COMBUSTION, HIGH SPEED PHOTOGRAPHY, HYPERVELOCITY PROJECTILES.

Subject Categories : Guns
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE