Accession Number : AD0453252


Title :   SPECTRUM-LINE-REVERSAL TEMPERATURE MEASUREMENTS THROUGH UNSTEADY RAREFACTION WAVES IN VIBRATIONALLY-RELAXING OXYGEN


Descriptive Note : Technical note


Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)


Personal Author(s) : Holbeche, T A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/453252.pdf


Report Date : Jun 1964


Pagination or Media Count : 26


Abstract : Pressure and spectrum-line-reversal temperature measurements were made of the structure of an unsteady expansion wave initiated in a vibrationally-excited gas in a shock tube by the rupture of a second diaphragm. With oxygen initially at about 2500 deg K and 0.75 atmospheres pressure the vibrational temperature was observed to fall from its initial (fully-frozen) value at the tail of the wave to a minimum before rising again to the original equilibrium value at the head of the wave. This agrees broadly with Appleton's calculations based on a linear rate law and Landau-Teller theory for Tau sub v, although the temperature minimum was slightly higher and occurred later than he predicted; it was also predicted qualitatively by Stulov. More detailed studies with, for example, nitrogen would be desirable for seeking a full explanation of the small differences with theory revealed by these preliminary tests.


Descriptors :   *TEMPERATURE , *VIBRATIONAL SPECTRA , SPECTROSCOPY , HIGH TEMPERATURE , EXCITATION , SHOCK WAVES , OXYGEN , SCIENTIFIC RESEARCH , RELAXATION TIME , NONEQUILIBRIUM FLOW , DISSOCIATION , GAS FLOW , KINETIC THEORY , UNITED KINGDOM , VIBRATION , MEASUREMENT , PRESSURE


Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE