Accession Number:

ADA244054

Title:

Fundamental Processes in Partially Ionized Plasmas

Descriptive Note:

Annual rept. 1 Oct 90-30 Sep 91,

Corporate Author:

STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB

Report Date:

1991-10-01

Pagination or Media Count:

25.0

Abstract:

Research during this past year has emphasized studies of plasmas properties and associated diagnostics, including nonequilibrium effects in so-called thermal plasmas. The present report discusses first measurements of the radiative source strength of air for temperatures in the range between 5000 and 7500K. To our knowledge these are the first measurements of this important property in this temperature range. The results are compared with a NASA computer code. Also described is a study of quenching effects on excited states of a nonequilibrium thermal plasma. These and companion measurements show that the common assumption of local thermodynamic equilibrium in plasmas at or about atmospheric pressure can be seriously in error and that as a result the reliability of many temperature measurements in such plasmas should be questioned. Contents Measurements of the volumetric radiative source strength of an air plasma between 5000 and 7500K and Electronic quenching of argon excited states in a non-equilibrium plasma at atmospheric pressure.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE