Accession Number : ADA264111


Title :   Navier-Stokes Computations for Kinetic Energy Projectiles in Steady Coning Motion - A Predictive Capability for Pitch Damping


Descriptive Note : Final rept. Sep 89-Jan 92,


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Weinacht, Paul ; Sturek, Walter B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264111.pdf


Report Date : Apr 1993


Pagination or Media Count : 44


Abstract : Previous theoretical investigations have proposed that the side force and moment acting on a body of revolution in steady coning motion could be related to the pitch damping force and moment. In the current research effort, this approach has been applied to produce the first known Navier-Stokes predictions of the pitch damping for finned projectiles. The flow field about pinned kinetic energy projectiles in steady coning motion has been successfully computed using a parabolized Navier-Stokes computational approach. The computations make use of a rotating coordinate frame in order to solve the steady flows equations. From the computed flow field, the side moment due to coning motion is used to determine the pitch-damping coefficient. The computational predictions of the slope of the side moment coefficient with coning rate normalized by the sine of the angle of attack have been compared with pitch damping coefficients determined from range firings for two finned projectile configurations. The predictions show good agreement with the range data. This computational approach provides a significant predictive capability for the design of kinetic energy projectiles whose terminal ballistic performance can be degraded by moderate levels of yaw at the target.... Projectiles, Numerical analysis, Aerodynamic characteristics, Computations, Aerodynamics, Navier-Stokes Equations.


Descriptors :   *COMPUTATIONS , *KINETIC ENERGY PROJECTILES , *NAVIER STOKES EQUATIONS , *BODIES OF REVOLUTION , ANGLES , YAW , PREDICTIONS , ATTACK , ENERGY , NUMERICAL ANALYSIS , DAMPING , MOTION , RATES , MOMENTS , ANGLE OF ATTACK , TARGETS , FLOW FIELDS , TERMINAL BALLISTICS , COEFFICIENTS , CONFIGURATIONS , TERMINALS , AERODYNAMICS , GUN LAUNCHED , BALLISTICS , COORDINATES , KINETIC ENERGY , AERODYNAMIC CHARACTERISTICS , SLOPE , FLOW , FRAMES , KINETICS , AGREEMENTS


Subject Categories : Ammunition and Explosives
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE