Accession Number:

ADA139595

Title:

Theory of Beam Channel Hydrodynamics

Descriptive Note:

Memorandum rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1984-03-07

Pagination or Media Count:

17.0

Abstract:

This document reports on recent theoretical studies and numerical simulations of hot channels produced in a gaseous medium by a beam. Experiments by Greig et al. have demonstrated that similar channels produced by electric discharges andor laser pulses in air or nitrogen undergo rapid, turbulent cooling. It explains this phenomenon on the basis of vorticity generation by zero-order misalignment of pressure and density gradients as the hot channel expands to pressure equilibrium. Derived are equations describing the residual vortex strength and mixing time scale for fundamental classes of asymmetry. Comparisons of theoretical calculations to numerical simulations and to experimental data on laser and discharge channels provide a calibration of the theory and permit the identification of the most important sources of turbulence in beam channels.

Subject Categories:

  • Numerical Mathematics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE