Experiments in a 120-mm Ram Accelerator at Elevated Pressures.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1996
- Accession Number
- ADA318454
Entities
People
- A. W. Horst
- D. L. Kruczynski
- F. Liberatore
Organizations
- United States Army Research Laboratory