Accession Number:

AD0659739

Title:

PRELIMINARY TEMPERATURE MEASUREMENTS BEHIND STRONG SHOCK WAVES IN ARGON,

Descriptive Note:

Corporate Author:

TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s):

Report Date:

1967-09-01

Pagination or Media Count:

67.0

Abstract:

The need for temperature measurement in strong shock waves is discussed briefly and requirements for a suitable experimental method are established. Spectrometric methods are shown to be appropriate and the radiative line intensity technique is discussed. Experiments using photography for both time-integrated and time-resolved exploration of the argon emission spectrum in a M sub s 11.3, p sub 1 3 torr shock are described. The results were used in the main series of experiments, which gave time-resolved records from photo-multipliers monitoring the intensities of selected neutral argon lines. These records are analyzed, including self-absorption correction, to a time-resolved excitation temperature profile for the neutral argon atoms. The probable uncertainty in these measurements is computed and the shape of the temperature profile is discussed. The conclusions are that the atom excitation temperature rises to an approximately constant value of about 11,500K behind the shock front, which is in fair agreement with the calculated equilibrium value of 11,300K, but that uncertainties were too great to allow, for example, cooling calculations based on the shape of the temperature profile. Experimental improvements are suggested to reduce uncertainties and allow detailed analyses in future work. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE