Effect of Temperature Sensitivity and Plasticizer Diffusive Transport on Performance of Layered Solid Propellants under Electrothermal Plasma Injection

摘要

The temperature of the propellant's bed may play a role in the burn rates under plasma injection. In this report, a set of experiments was 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 m/s. Following characterization of the plasma-flow field, a set of experiments was conducted on JA-2 solid propellant with controlled bed temperature. Experiments, with proposed models, revealed a functional form that includes the bed temperature. Increased burn rates were observed with increased bed temperature, which appears to follow a power law. A model for the burn rate is proposed, which includes the bed temperature and has the burn rate equals A P(a) (T/T ambient)(b). Further investigation of plasma parameters helped to modify the proposed model to include plasma radiative heat flux and plasma number density. (6 tables, 19 figures, 29 refs.).