Jpn. J. Appl. Phys. 22 (1983) pp. 735-741 |Next Article| |Table of Contents|
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Experimental Study on the Ionization of Argon behind Reflected Shock Waves
Department of Mechanical Engineering, Faculty of Engineering, Yokohama National University
(Received November 5, 1981; accepted for publication January 22, 1983)
The electron temperature and density along with the ion temperature in argon gas behind reflected shock waves were measured by laser light scattering, while the spectroscopic temperature was measured from the ArI line emissions. The values of these three temperatures are different from each other for a few hundred microseconds after arrival of the reflected shock front. Both the electron and ion temperatures are much higher than the theoretical gasdynamic temperature, while the spectroscopic temperature is lower than the theoretical one. The degree of ionization is much higher than that in the equilibrium state. The stochastic character of the ArI line emissions was observed, indicating that the gas is inhomogeneous. These phenomena are explained as follows: initially, the gas behind the reflected shock wave is inhomogeneous, and an associative ionization is initiated at some points. The gas becomes homogeneous mainly through diffusion.
- H. Oertel: Stossrohre (Springer Verlag, Wien, New York, 1966) p. 787.
- Yu. A. Dunaev, G. K. Tumakev, T. V. Zhikhareva and V. R. Lasovskaya: Proc. 8th Int. Shock Tube Symp., London, 1971 (Chapman and Hall, London, 1971) p. 33.
- K. P. Schneider and H. Grönig: Proc. 8th Int. Shock Tube Symp., London, 1971 (Chapman and Hall, London, 1971) p. 44.
- H. Grönig: Proc. 10th Int. Shock Tube Symp., Kyoto, 1975 (Shock Tube Research Society, Japan) p. 89.
- F. Demmig: Proc. 11th Int. Symp. on Shock Tubes & Waves, Seatle, 1977 (University of Washington Press, Seatle and London, 1977) p. 119.
- E. F. Greene and J. P. Toennies: Chemische Reaktionen in Stoss-wellen, translated in German by H. Gg. Wagner (D. Steinkopf Verlag, Darmstadt, 1959) p. 20.
- H. J. Kunze: Plasma Diagnostics (North Holland Publishing Co., Amsterdam, 1968) p. 550.
- S. S. Penner: Quantitative Molecular Spectroscopy and Gas Emissivities (Addison-Wesley Publishing Co. Inc., Massachusetts, 1959) p. 457.
- W. H. Kegel: IPP 6/34, Institut f. Plasmaphysik, Garching (1968).
- W. Lochte-Holtgrever: Plasma Diagnostics (North Holland Publishing Co., Amsterdam, 1968) p. 178.
- S. V. Desai and W. H. Corcoran: J. Quant. Spectrosc. & Radiat. Transfer 8 (1968) 1721.
- M. Hirata: Ooyo Tokeigaku (Applied Statistics) (Kokuseido, Tokyo, 1949) 11.10 [in Japanese].
- K. Terao:
Jpn. J. Appl. Phys. 16 (1977) 29[JSAP].
- K. Terao, F. Hatano and F. Sano:
Jpn. J. Appl. Phys. 3 (1964) 728[JSAP].
- W. B. Thompson: An Introduction to Plasma Physics (Pergamon Press, Oxford, London, New York and Paris, 1962) p. 19.
- K. Terao and K. Yamamoto: Proc. 8th Int. Shock Tube Symp., London, 1971 (Chapman and Hall, London, 1971) p. 43.
- H. Nakamura and M. Matsuzawa: Butsuri 25 (1970) 727 [in Japanese].
- G. E. Veatch and H. J. Oskam:
Phys. Rev. A 1 (1970) 1499[APS].
- C. P. Schneider and G. Hahne: Proc. 12th Int. Symposium on Shock Tubes & Waves, Jerusalem, 1979 (The Magnes Press, The Hebrew University, Jerusalem, 1980) p. 222.