Analysis of Turbulent Shear Flows in Laser Nozzles and Cavities

Abstract

An invariant second-order closure program for compressible shear flows has been developed at ARAP. The program has been applied to study a simulation of the mixing region in a HF chemical laser. Considerable insight into the complex processes occurring in laser cavities has been achieved by these studies. The results show that the assumptions used in the eddy viscosity and the turbulent kinetic energy closure methods are not completely valid for nonequilibrium flows such as in the chemical laser system. The results of studies of other shear flows with the same invariant second-order model are in generally good agreement with experimental measurements, but suggest the need for improvement of the pressure diffusion model for high speed compressible flows.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1974
Accession Number
AD0784862

Entities

People

  • Ashok K. Varma
  • Robert A. Beddini
  • Roger D. Sullivan

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Lasers
  • Differential Equations
  • Diffusion
  • Energy
  • Equations
  • Flow
  • Fluid Dynamics
  • Gas Flow
  • Kinetic Energy
  • Laser Resonators
  • Lasers
  • Nonequilibrium Flow
  • Shear Flow
  • Turbulent Flow
  • Turbulent Mixing
  • Viscosity

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy