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Proceedings Paper

Numerical analysis of O2 and H2O effects on CO2 gas dynamic lasers
Author(s): K. Ebina; T. Yokozawa; Shigeru Yamaguchi; Hirotaka Kanazawa; Hiroshi Hara; Yasuharu Mine; Katsuhiko Komatsu; Hideaki Saito
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Paper Abstract

A six-temperature vibrational relaxation model that takes into account the vibrational levels of O2 and H2O is proposed, based on which a simulation code has been developed with which analyses have been conducted on the effects brought on the performance of combustion- driven gasdynamic lasers by the presence of O2 and H2O in the medium. Inclusion of the vibrational levels of O2 and H2O in the vibrational relaxation model has proved to ensure good agreement of estimated results with experimental data over a wide range of gas composition (0 - 40% O2, 0 - 10% H2O). Both calculation and experiment have indicated that with the presence of 3% H2O, an increase of 1% in O2 concentration would lower the small signal gain by 1%. The simulation estimated that increasing concentration of H2O in the laser medium accentuates the effect of O2 on the lasing performance. This six-temperature vibrational relaxation model should permit reliable analysis to be performed on gasdynamic laser characteristics even when large amounts of O2 and H2O are present in the medium.

Paper Details

Date Published: 4 May 1993
PDF: 4 pages
Proc. SPIE 1810, 9th International Symposium on Gas Flow and Chemical Lasers, (4 May 1993); doi: 10.1117/12.144655
Show Author Affiliations
K. Ebina, Ishikawajima-Harima Heavy Industries Co., Ltd. (Japan)
T. Yokozawa, Ishikawajima-Harima Heavy Industries Co., Ltd. (Japan)
Shigeru Yamaguchi, Ishikawajima-Harima Heavy Industries Co., Ltd. (Japan)
Hirotaka Kanazawa, Ishikawajima-Harima Heavy Industries Co., Ltd. (Japan)
Hiroshi Hara, Ishikawajima-Harima Heavy Industries Co., Ltd. (Japan)
Yasuharu Mine, Japan Defense Agency (Japan)
Katsuhiko Komatsu, Japan Defense Agency (Japan)
Hideaki Saito, Japan Defense Agency (Japan)


Published in SPIE Proceedings Vol. 1810:
9th International Symposium on Gas Flow and Chemical Lasers

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