New Pressure Gradient Equations for Lumped-Parameter Interior Ballistic Codes

Abstract

Lumped-parameter models of interior ballistics require a relation between the space mean pressure and the pressure at the base of the projectile. Typically, this is furnished using the closed form analyses of Lagrange or of Pidduck and Kent. These relations do not take into account the non-uniform cross-sectional area of the chamber of the gun and the two-phase structure of the flow propellant grains and their products of combustion. This report describes analytical relations which reflect first the variation in cross- sectional area, second the two-phase structure of the flow and third, the combination of both variable area and two-phase flow. These three sets of relations are programmed into a lumped-parameter code the results of which are compared with those from a quasi-one-dimensional two-phase flow code. Significant improvements in predictive capacity are observed relative to the traditional Lagrange formula when high performance charges are considered. Keywords: Two phase flow.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1990
Accession Number
ADA222590

Entities

People

  • Frederick W. Robbins
  • Paul S. Gough
  • Ronald D. Anderson

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Resistance
  • Base Pressure
  • Burning Rate
  • Combustion
  • Databases
  • Engineering
  • Equations
  • Heat Transfer
  • Interior Ballistics
  • Jet Propulsion
  • Mechanical Engineering
  • Military Research
  • Munitions
  • Pressure Distribution
  • Pressure Gradients
  • Propellant Grains
  • Two Dimensional

Readers

  • Combustion and Flow Dynamics.
  • Computational Modeling and Simulation
  • ballistics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster