Accession Number:

ADA289645

Title:

Computational Flight Design of .50 Caliber Limited Range Training Ammunition.

Descriptive Note:

Final rept. Feb 93-Apr 94,

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

• Guidos, Bernard J.
• Chung, Sung K.

Report Date:

1995-01-01

Pagination or Media Count:

48.0

Abstract:

A computational design study is presented of the aerodynamics and flight behavior of a limited range training round being developed for U.S. Army .50 caliber ammunition. The training round boattail possesses sub-caliber finlets, which impose sufficient spin damping on the projectile to cause it to enter a gyroscopically unstable, high drag flight mode at some distance down range. Aerodynamics coefficients are computed for the training round design and for existing .30 caliber rounds using a parabolized Navier-Stokes viscous flow solver. The aerodynamics coefficients for the existing rounds are compared to range firings. Six-degree-of-freedom trajectory simulations are made to determine the yawing behavior of the training round design, and comparisons are made with Doppler radar test firing results. The present design is evaluated in terms of the flight performance requirement, and design modifications are recommended. AN

Descriptors:

• *COMPUTATIONAL FLUID DYNAMICS
• *PROJECTILE TRAJECTORIES
• *AERODYNAMICS
• COMPUTERIZED SIMULATION
• REQUIREMENTS
• FLIGHT TESTING
• YAW
• FIRING TESTS(ORDNANCE)
• DAMPING
• DEGREES OF FREEDOM
• AERODYNAMIC DRAG
• TRAINING AMMUNITION
• SPINNING(MOTION)
• FLIGHT ENVELOPE
• SUPERSONIC FLOW
• RANGE(DISTANCE)
• NAVIER STOKES EQUATIONS
• VISCOUS FLOW
• BOATTAIL AFTERBODIES

Subject Categories:

• Ballistics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE