Computational Modeling of the Base Region Flow for a Projectile with a Base Cavity

Abstract

Recent firing results indicated some differences in drag between projectiles with modified base configurations. This report documents a computational study to predict the drag of shell with modified base configurations similar to the ones tested. Flow field computations using a thin layer Navier-Stokes computational technique have been performed for a PXR projectile configuration with and without a base cavity on the base region flow field. Quantitatively, a reduction in base drag of about 25% was found due to the cavity. The magnitude of this reduction may have been over predicted; also some questions as to whether or not the base region is unsteady still remain to be investigated. Keywords: Rocket assisted projectiles; Numerical computations; Axisymmetric projectile; Time Dependent; Base flow; Compressible flow; Implicit algorithm.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1985
Accession Number
ADA157247

Entities

People

  • C. J. Nietubicz
  • J. Sahu

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Base Flow
  • Base Pressure
  • Computational Fluid Dynamics
  • Computations
  • Drag
  • Engineering
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Free Stream
  • Mach Number
  • Mechanical Engineering
  • Projectiles
  • Steady State
  • Turbulent Mixing
  • Weapons

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.
  • ballistics.