Secondary Waves from Nozzle Blast

Abstract

Blast signatures at the gunner's position produced by recoilless rifles and rocket launchers often exhibit a strong secondary wave following chamber blowdown. To identify its source a series of experiments was performed using a helium-driven blast simulator. The resulting pressure traces and shadowgraphs show the wave emerging from the portion of the plume just aft of the nozzle, but leave unexplained its relationship to the plume flow field structure. This information was obtained from a numerical solution of the Euler equations using Harten's Total Variation Diminishing (TVD) scheme. Based on this data, contour and surface plots of pressure were constructed which reveal quite clearly the plume wave structure and its response to the falling chamber pressure. A secondary wave emerges from the same region of the plume as it did in the experiment.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1984
Accession Number
ADA149426

Entities

People

  • G. C. Carofano

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Classification
  • Computer Simulations
  • Computers
  • Equations
  • Euler Equations
  • Flow
  • Launchers
  • Military Research
  • Molecular Dynamics
  • Plastic Explosives
  • Recoilless Rifles
  • Rocket Launchers
  • Secondary Waves
  • Security
  • Simulators
  • Waves
  • Weapons

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Computational Fluid Dynamics (CFD)
  • Marksmanship and Weaponry.