The Design of Sub-Caliber Aero-Thermal-Chemical (ATC) Gun Projectiles for Aerodynamic Stability

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 20097
Amount: $59,776.00
Phase: Phase I
Program: SBIR
Awards Year: 1993
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
147 Ward Street, Hightstown, NJ, 08520
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Thomas H. Sobota, Phd
 (609) 443-4986
Business Contact
Phone: () -
Research Institution
The following proposal details an effort required for understanding the in-bore aerodynamic stability of sub-caliber projectiles in aero-thermal- chemical (ATC) guns in order to design stable projectiles. The ATC gun is based on the concept of a projectile traveling through the propellant and deriving acceleration from the expansion of gases on the aft end of projectile. Since the projectile must travel through the propellant, the projectile is generally sub-caliber so that the propellant can flow around it. One of the most important unanswered questions in Ram and Scramaccelerator technology relates to the in-bore aerodynamic stability of the projectiles. If the stability of these sub-caliber projectiles was understood several important design problems for ramaccelerator systems could be greatly simplified. In the proposed Phase I effort, the in-bore aerodynamic stability of Ramaccelerator projectiles will be examined. A three-dimensional computational fluid dynamics (CFD) code will be used to assess the static stability of the projectile, the effect of several shape parameters on stability will be explored and a linearized analysis for the dynamic stability will be performed. The results of the Phase I effort will demonstrate the usefulness of CFD as a stability analysis tool and lay the groundwork for the study of the dynamic stability in Phase II.

* Information listed above is at the time of submission. *

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