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Study of vibrational deactivation of molecules of carbon dioxide gas during cooling of stream in a supersonic nozzle

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Journal of Applied Mechanics and Technical Physics Aims and scope

Abstract

The vibrational temperature of the antisymmetrical type of vibrations (v 3) of the CO2 molecule at the exit of a supersonic nozzle is measured in the present work using the method of recording the infrared emission. Freezing in of thev 3-type vibrations was observed during the flow of undiluted carbon dioxide in a nozzle. In this case the vibrational temperature T3 considerably exceeded the translational temperature. On the basis of a comparison of the experimental results with calculation it can be concluded that vibrational deactivation of CO2 molecules occurs three to five times faster than the excitation of the vibrations during heating in a shock wave. All the experiments were conducted under the following conditions: maximum expansion of gas in nozzle A/A* = 115, temperature range 1900–2400 °K, pressure range 1–17.5 atm.

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Literature cited

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Authors and Affiliations

  1. Moscow

    N. V. Evtyukhin, S. A. Losev, V. N. Makarov, V. A. Pavlov & M. S. Yalovik

Authors
  1. N. V. Evtyukhin
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  2. S. A. Losev
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  3. V. N. Makarov
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  4. V. A. Pavlov
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  5. M. S. Yalovik
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Additional information

Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 6, pp. 32–40, November–December, 1973.

The authors are grateful to U. G. Pirumov and É. A. Ashratov for the calculation of the nozzle profile and the distribution of streamlines as well as for a discussion of the results.

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Evtyukhin, N.V., Losev, S.A., Makarov, V.N. et al. Study of vibrational deactivation of molecules of carbon dioxide gas during cooling of stream in a supersonic nozzle. J Appl Mech Tech Phys 14, 763–769 (1973). https://doi.org/10.1007/BF00853188

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  • DOI: https://doi.org/10.1007/BF00853188

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