# Two-dimensional analysis of a 16-m m CO2 downstream-mixing gasdynamic laser

Chakravarty, Purandar and Reddy, NM and Reddy, KPJ (1987) Two-dimensional analysis of a 16-m m CO2 downstream-mixing gasdynamic laser. In: AIAA Journal, 25 (5). pp. 713-720.

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## Abstract

A theoretical analysis of a 16-\mu m $CO_2-N_2-H_2$ downstream-mixing gasdynamic laser, where a cold $CO_2$, $H_2$ stream is mixed with a vibrationally excited $N_2$ stream, tangentially downstream of the nozzle exit, is presented. The flowfield is analyzed numerically using 2-dimensional, unsteady, laminar, and viscous flow modeling, including the appropriate finite-rate vibrational kinetic equations. The effect of variation of different flowfield parameters on 16-mm small-signal gain is studied, and results are discussed in detail. The anal. shows that the presence of $H_2$ gas is detrimental to small-signal gain. The velocity ratio 1:1 between the $CO_2$, $H_2$, and $N_2$ mixing streams is the best choice rendering local small-signal gain as high as 21.75 $m^-1$ and corresponding av. small-signal gain of 16.7 $m^-1$ for $N_2$ reservoir temp. of 2000 K. These high values of small-signal gain clearly underscore the high potential which a downstream-mixing scheme has over the conventional methods for a 16-\mu m laser source.

Item Type: Journal Article AIAA Journal American Institute of Aeronautics and Astronautics Copyright for this article belongs to the American Institute of Aeronautics and Astronautics Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) 06 May 2008 19 Sep 2010 04:44 http://eprints.iisc.ac.in/id/eprint/13858