A METHOD FOR DETERMINING THE BULK PROPERTIES OF ARC-HEATED ARGON
Final rept. Jul 1967-Sep 1968
ARO INC ARNOLD AFS TN
Pagination or Media Count:
The total temperature and total pressure of argon gas at the exit of a direct-current arc jet are determined by using a corrected version of the one- dimensional, constant-area, heat-addition analysis. The corrections are formulated in terms of the thrust produced by the arc jet and are determined by measuring the actual thrust. To assess the validity of properties determined in this manner, a method of characteristics solution of the general potential flow equations was obtained for the flow field resulting from a free expansion of the gas from these properties into a low pressure. Mach numbers given by this solution were then compared with those derived from measured pitot pressures in the expanded stream. The agreement between the predicted and the average measured values of Mach number is within about 4 percent. This would allow the average static temperature to be predicted within about 8 percent and the average static pressure to be predicted within about 18 percent. This indicates that the method of predicting the gas properties at the exit of the arc jet can be used as a first approximation.
- Plasma Physics and Magnetohydrodynamics