Accession Number:

ADA000572

Title:

Turbulent Shear Flows in Laser Nozzles and Cavities.

Descriptive Note:

Final technical rept. Feb-Oct 74,

Corporate Author:

AERONAUTICAL RESEARCH ASSOCIATES OF PRINCETON INC N J

Report Date:

1974-10-01

Pagination or Media Count:

44.0

Abstract:

An invariant second-order closure program for compressible, turbulent, reacting shear flows is being developed. The development of models for the third and higher-order correlations that appear in the transport equations has been completed. A typical eddy box model has been developed for computation of higher-roder scalar correlations involving species, temperatures and reaction rate fluctuations. A single species second-order closure program for compressible shear flows 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. 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. Modified author abstract

Subject Categories:

  • Lasers and Masers
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE