Accession Number : ADA328097

Title :   Augmentation and Control of Burn Rates in Plasma Devices.

Descriptive Note : Progress rept. 1 Jul 96-30 Jun 97,

Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF NUCLEAR ENGINEERING

Personal Author(s) : Bourham, Mohamed A. ; Gilligan, John G.

PDF Url : ADA328097

Report Date : 01 JUL 1997

Pagination or Media Count : 9

Abstract : Further investigation of radiative heating and boundary layer problem in electrothermal-chemical devices shows that radiative heating plays a major role in burn process at the plasma-propellant interface. However, combined effect of both radiative heating and plasma kinetic pressure is not totally resolved. Measured burn rates shows increased burn for increased plasma pressure, however, analysis of plasma parameters for same data revealed an increased burn rate for increased plasma temperature. Assessing the effect of plasma parameters on burn rates necessitates decoupling combined effects, especially the pressure and temperature. The measured pressure peaks to 3200 psi for a nozzle attachment that has a conical shape for choked flow. The radiation transport model has been tested without surface ablation, and is currently added to the most recent code version, to investigate the effects of radiation in cases with ablation. A new extrapolation boundary condition has been implemented at the surface. This boundary condition gives improved radiation energy profiles near the wall, and is consistent with the diffusion approximation used in the radiation transport model.

Descriptors :   *BURNING RATE, *PLASMA DEVICES, ABLATION, MODELS, RADIATIVE TRANSFER, THERMAL DIFFUSION, BOUNDARY VALUE PROBLEMS, PRESSURE, EXTRAPOLATION, RADIANT HEATING.

Subject Categories : Plasma Physics and Magnetohydrodynamics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE