Numerical Simulation of a Multi-Compartmented Gun Muffler and Comparison with Experiment

Abstract

The internal flow of a multi-compartmented muffler was investigated both by experiment and simulation to determine the attenuating mechanisms and internal flow of gun mufflers. The muffler, which had approximately nine times the internal volume of the bore and chamber of the gun, was attached to the 25mm M242 cannon. Pressure transducers were inserted at selected locations on the cylinder of the muffler and gun barrel to measure internal pressures. The simulation of the experiment, as implemented on a Cray XMP-48 computer, solved the Euler equations of compressible flow by using the second-order-accurate- total-variation-diminishing (TVD) shock-capturing scheme of Harten. The calculation yielded a detailed picture of the flow field, as displayed by pressure and Mach contours. Comparisons of the simulation with experiment showed that some burning of propellant in the muffler chambers was occurring even though the muffler had been purged with nitrogen. Salient features of the muffler internal flow are discussed. Keywords: Gas dynamics, Combat noise, Acoustic attenuation, Gun components.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1990
Accession Number
ADA227336

Entities

People

  • Charlie H. Cooke
  • David H. Lyon
  • Kevin S. Fansler
  • W. G. Thompson

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Equations
  • Euler Equations
  • Fluid Dynamics
  • Fluid Flow
  • Gas Dynamics
  • Gun Components
  • Military Research
  • Munitions
  • New York
  • Physics Laboratories
  • Projectiles
  • Turbulent Mixing
  • United States
  • Weapons

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.
  • Computational Fluid Dynamics (CFD)