Studies Supporting Development of a Modified Gradient Equation for Lumped-Parameter Interior Ballistic Codes

Abstract

Test firings of 120-mm rounds were performed to characterize effects due to the combustible cartridge cases used. Comparisons were made between measured ballistic parameters, especially gas pressures, and those predicted by computerized simulation calculations performed with interior ballistic codes. It was found that the two-phase flow gun code XNOVAKTC(XKTC)modeled the gun firings very accurately. On the other hand, the results of calculations with IBHVG2, a lumped-parameter interior ballistic code, differed significantly from both the measurements and the XKTC calculations. The difference is much larger for systems with large charge-mass-to-projectile-mass(C/M)ratios. Ballistic parameters which affect the pressure gradient, especially for large C/M ratios, are examined in detail. One parameter which is essential to good physical modeling is chambrage, the narrowing of the case mouth of the cartridge; other potentially important parameters are identified. Keywords: Gradient equations. (edc)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA195705

Entities

People

  • Frederick W. Robbins
  • George E. Keller

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Ammunition
  • Artillery
  • Base Pressure
  • Burning Rate
  • Combustion
  • Databases
  • Engineering
  • Equations
  • Jet Propulsion
  • Mechanical Engineering
  • Military Research
  • Munitions
  • Pressure Gradients
  • Projectiles
  • Propellants
  • Resistance
  • Weapons

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Modeling and Simulation
  • ballistics.