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Shock wave air dissociation and ionization; Dissociation et ionisation de l'air par une onde de choc

Technical Report:

Abstract

The composition and internal energy of air are computed for a range of temperature from 3 500 up to 11500 deg. K and a range of density from 4 up to 12 times normal density. In another connection, the increase of internal energy of air by a shock wave traveling through it is evaluated in terms of the same parameters. By adjusting both expressions of energy, a relation between the temperature T and the ratio of molecular volumes V{sub 0}/V ahead and behind the shock front is obtained. The others physical variables, pressure, front velocity, material velocity, degree of ionization, can be then computed if either of parameters T or V{sub 0}/V is known. Conversely, measurement of any one physical variable makes it possible to get values of all the others. Present calculations show the oxygen to be completely dissociated by strong shock waves (velocities above 7000 m/s), the nitrogen by a rate of 50 % higher, and the concentration of free electrons to be over 0,1 %. Reprint of a paper published in 'Le journal de physique et le radium', Tome 19, July 1958, p. 639-648 [French] La composition de l'air et la valeur de son energie interne sont  More>>
Authors:
Thouvenin, J. [1] 
  1. Commissariat a l'energie atomique et aux energies alternatives - CEA (France)
Publication Date:
Jul 01, 1959
Product Type:
Technical Report
Report Number:
CEA-R-1251
Resource Relation:
Other Information: 6 refs.
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; AIR; COMPRESSION; DISSOCIATION ENERGY; ENERGY ABSORPTION; ENERGY LEVELS; EQUILIBRIUM; FREE ENERGY; IONIZATION; PARTITION FUNCTIONS; RANKINE-HUGONIOT EQUATIONS; ROTATION-VIBRATION MODEL; SHOCK WAVES; TEMPERATURE DEPENDENCE; VELOCITY; WAVE PROPAGATION
OSTI ID:
22669626
Research Organizations:
Commissariat a l'energie atomique et aux energies alternatives - CEA, Centre d'Etudes Nucleaires de Saclay, Service de Documentation, BP No.2, 91190 Gif-sur-Yvette (France)
Country of Origin:
France
Language:
English; French
Other Identifying Numbers:
TRN: FR1800527015511
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
12 page(s)
Announcement Date:
Mar 13, 2018

Technical Report:

Citation Formats

Thouvenin, J. Shock wave air dissociation and ionization; Dissociation et ionisation de l'air par une onde de choc. France: N. p., 1959. Web.
Thouvenin, J. Shock wave air dissociation and ionization; Dissociation et ionisation de l'air par une onde de choc. France.
Thouvenin, J. 1959. "Shock wave air dissociation and ionization; Dissociation et ionisation de l'air par une onde de choc." France.
@misc{etde_22669626,
title = {Shock wave air dissociation and ionization; Dissociation et ionisation de l'air par une onde de choc}
author = {Thouvenin, J.}
abstractNote = {The composition and internal energy of air are computed for a range of temperature from 3 500 up to 11500 deg. K and a range of density from 4 up to 12 times normal density. In another connection, the increase of internal energy of air by a shock wave traveling through it is evaluated in terms of the same parameters. By adjusting both expressions of energy, a relation between the temperature T and the ratio of molecular volumes V{sub 0}/V ahead and behind the shock front is obtained. The others physical variables, pressure, front velocity, material velocity, degree of ionization, can be then computed if either of parameters T or V{sub 0}/V is known. Conversely, measurement of any one physical variable makes it possible to get values of all the others. Present calculations show the oxygen to be completely dissociated by strong shock waves (velocities above 7000 m/s), the nitrogen by a rate of 50 % higher, and the concentration of free electrons to be over 0,1 %. Reprint of a paper published in 'Le journal de physique et le radium', Tome 19, July 1958, p. 639-648 [French] La composition de l'air et la valeur de son energie interne sont calculees pour des temperatures allant de 3 500 a 11 500 deg. K et des densites de 4 a 12 fois superieures a la densite normale. D'autre part, on determine, en fonction des memes parametres, l'augmentation d'energie interne de l'air due au passage d'une onde de choc. En egalant les deux expressions de l'energie, on obtient une relation entre la temperature T et le rapport des volumes moleculaires V{sub 0}/ V devant et derriere le front de choc. Les valeurs des autres grandeurs physiques, pression, vitesse du front, vitesse d'ecoulement, taux d'ionisation dans le front, sont alors determinees si l'on connait l'un des parametres T ou V{sub 0}/ V. Inversement, la mesure de l'une quelconque de ces grandeurs physiques permet de fixer la valeur de toutes les autres. Le calcul montre que pour des chocs intenses (vitesses superieures a 7000 m/s), la dissociation de l'oxygene est totale, celle de l'azote avancee a plus de 50 %, et la proportion d'electrons libres superieure a 0,1 %. Reproduction d'un article publie dans 'Le journal de physique et le radium', Tome 19, July 1958, p. 639-648.}
place = {France}
year = {1959}
month = {Jul}
}