Accession Number:

ADA390715

Title:

Initiation of Chemical Reactions in Energetic Materials Using Plasmas and Arc Channels

Descriptive Note:

Progress rept. 1 Aug 2000-30 April 2001

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF NUCLEAR ENGINEERING

Personal Author(s):

Report Date:

2001-05-24

Pagination or Media Count:

16.0

Abstract:

Development of arc channels in propellant beds will lead to initiation of chemical reactions and possible ignition. Same initiation can take place with high-energy density plasmas generated by electrothermal plasma sources. Arc channels can be simulated via arc generators from as low as few milli-joules to several joules of energy. For electrothermal plasmas, the energy is in the range of few kilo-joules. When using electrothermal plasmas, the performance of the propellant is more governed by radiation transport and the plasma-flow-field parameters. The temperature of the propellants bed may also play a role in the burn rates under plasma injection. In this report, a set of experiments were first conducted on the plasma-flow-field to determine the spatial and temporal distribution of the plasma temperature, pressure, number density, and velocity. The experiments revealed a decreasing plasma pressure, plasma temperature and plasma number density as plasma is leaving the capillary source and expands in air. The plasma jet velocity 2 inches from the source exit was found to be about 1300 ms. Following characterization of the plasma-flow-field, a set of experiments were conducted on JA-2 solid propellant with controlled bed temperature. Increased burn rates were observed with increased bed. A model for the burn rate is proposed, which includes the bed temperature and has the BR A Psup a TTsub ambientsup b.

Subject Categories:

  • Physical Chemistry
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE