Accession Number : ADA318454

Title :   Experiments in a 120-mm Ram Accelerator at Elevated Pressures.

Descriptive Note : Final rept. Mar-Jun 93,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kruczynski, D. L. ; Horst, A. W. ; Liberatore, F.

PDF Url : ADA318454

Report Date : NOV 1996

Pagination or Media Count : 34

Abstract : Ram acceleration is an emerging propulsion technology in which a projectile similar in shape to the centerbody of a ramjet aircraft engine is injected into a tube filled with a combustible gaseous mixture. As the projectile moves into the tube under supersonic conditions, shocks occur on and around the projectile. If the gases ignite, the combustion can be self-sustaining, generating a localized high-pressure region that travels with the projectile producing acceleration. Velocities of more than 2.6 km/s have been experimentally demonstrated, while theory predicts velocities above 7 km/s are obtainable. The U.S. Army Research Laboratory (ARL) is studying the physics of the ram acceleration process through an integrated experimental and computational fluid dynamics effort. ARL operates the world's largest ram accelerator at 120-mm bore size. Initial experimental results at this facility are presented. In addition, data from experiments at gaseous fuel pressures up to 102 atm are presented. Impact of 'high pressure' operation on facility design and application are considered. Finally, future plans are summarized.

Descriptors :   *ACCELERATION, *PROJECTILES, INTEGRATED SYSTEMS, ARMY RESEARCH, AIRCRAFT ENGINES, FACILITIES, HIGH PRESSURE, COMPUTATIONAL FLUID DYNAMICS, REGIONS, GASES, MIXTURES, COMBUSTION, FUELS, PROPULSION SYSTEMS, RAMJET ENGINES, PHYSICS, PRESSURE, OPERATION, TRAVEL, FLUID DYNAMICS, SUPERSONIC CHARACTERISTICS.

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE