Mixing of post-discharge O2/He flow with NO2/He flow: 3D modeling of experimental data

T. V. Rakhimova; A. P. Palov; Yu. A. Mankelevich; N. A. Popov; D. L. Carroll

doi:10.1117/12.738874

26 April 2007 Mixing of post-discharge O₂/He flow with NO₂/He flow: 3D modeling of experimental data

T. V. Rakhimova, A. P. Palov, Yu. A. Mankelevich, N. A. Popov, D. L. Carroll

Proceedings Volume 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 634622 (2007) https://doi.org/10.1117/12.738874
Event: XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2006, Gmunden, Austria

Abstract

Flow mixing and chemical kinetics in the afterglow of an electro-discharge source of singlet oxygen O₂(a¹&Dgr;_g) are studied theoretically using both a simple analytical approach and an advanced three-dimensional (3D) simulation with the FLUENT code. Calculated results are compared with titration measurements of atomic oxygen flow in the discharge oxygen-iodine laser (DOIL) system in which the first positive gain and continuous-wave laser oscillation were demonstrated. It was shown that atomic oxygen atoms in rf post-discharge O₂/He mixtures effectively deplete O₂(a¹&Dgr;_g) molecules through quenching of the excited iodine atoms. Thus, the precise technique for O atom flow measurements and methods of removing O atoms are of importance for DOIL operation. One technique is through the ad-mixing of NO₂ to the post-discharge flow which allows control of the O atom flow. Theoretical predictions of NO₂* production (and equivalently the emission), using both an analytical solution of a simplified system of equations and thorough 3D modeling of the reactive mixing flows, are compared with experimental measurements of NO₂* emission. Analysis of 3D calculated distributions of species concentrations and flow velocities shows how titration measurements should be calibrated correctly and validates the use of a simple analytical approach for the interpretation of titration measurements. It is recommended that NO₂ titrations for the flow conditions near to those examined use the value obtained from fully extinguishing the NO₂* emission.

Citation Download Citation

T. V. Rakhimova, A. P. Palov, Yu. A. Mankelevich, N. A. Popov, and D. L. Carroll "Mixing of post-discharge O₂/He flow with NO₂/He flow: 3D modeling of experimental data", Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 634622 (26 April 2007); https://doi.org/10.1117/12.738874

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