A Modified LaGrange Pressure Gradient for the Regenerative Liquid Propellant Gun

Abstract

A modified Lagrange gradient model for use in lumped parameter simulations of the regenerative liquid propellant gun is presented. The model accounts for the non-zero gas velocity at the barrel entrance and the rarefaction wave traveling along the barrel toward the projectile base after 'all-burnt' in a regenerative liquid propellant gun (RLPG). Computer simulations of a high velocity cannon have been conducted using a lumped parameter code with the modified Lagrange gradient and a second lumped parameter code with a one- dimensional barrel flow model. Comparisons of muzzle velocities, pressure versus time curves, and velocity and pressure profiles in the barrel are presented. The modified Lagrange gradient model provides results which are nearly indistinguishable from those obtained using the one dimensional model over the entire ballistic cycle. Calculated muzzle velocities agree to within 1-3% over the range 1500-2000 m/s, with the best agreement at the lower velocities. Interior ballistics.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
ADA218823

Entities

People

  • Terence P. Coffee
  • Walter F. Morrison

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Chambers
  • Combustion
  • Combustion Chambers
  • Computer Simulations
  • Jet Propulsion
  • Liquid Gun Propellants
  • Liquid Propellant Guns
  • Liquid Propellants
  • Munitions
  • Muzzle Velocity
  • Physical Properties
  • Pressure Distribution
  • Pressure Gradients
  • Projectiles
  • Propellants
  • Simulations
  • Weapons

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • ballistics.