Two-dimensional analysis of a 16-micron CO/sub 2/ downstream-mixing gasdynamic laser

Journal Article · Fri May 01 00:00:00 EDT 1987 · AIAA J.; (United States)

DOI:https://doi.org/10.2514/3.9687· OSTI ID:6288442

Chakravarty, P; Reddy, N M; Reddy, K P.J.

A theoretical analysis is presented for a 16-micron CO/sub 2/-N/sub 2/-H/sub 2/ downstream-mixing gasdynamic laser, where a cold CO/sub 2/-H/sub 2/ stream is mixed with a vibrationally excited N/sub 2/ stream, tangentially dowstream of the nozzle exit. The flowfield is analyzed numerically using two-dimensional unsteady laminar viscous flow modeling, including the appropriate finite-rate vibrational kinetic equations. The effect of variation of different flowfield parameters on 16-micron small-signal gain is studied, and results are discussed in detail. The analysis shows that the presence of H/sub 2/ gas is detrimental to small-signal gain. The velocity ratio 1:1 between the CO/sub 2/, H/sub 2/, and N/sub 2/ mixing streams is found to be the best choice rendering local small-signal gain as high as 21.75/m, with corresponding average small-signal gain of 16.7/m for N/sub 2/ reservoir temperature of 2000 K. These high values of small-signal gain clearly underscore the high potential which a downstream-mixing scheme has over conventional methods for a 16-micron laser source. 11 references.

• Research Organization: Indian Institute of Science, Bangalore, India
• OSTI ID: 6288442
• Journal Information: AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 25; ISSN AIAJA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CARBON DIOXIDE LASERS
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUATIONS
FLUID FLOW
GAS DYNAMIC LASERS
GAS LASERS
HYDROGEN
INFRARED RADIATION
KINETIC EQUATIONS
LAMINAR FLOW
LASERS
MATHEMATICS
MIXING
NITROGEN
NONMETALS
NUMERICAL ANALYSIS
RADIATIONS
TWO-DIMENSIONAL CALCULATIONS
UNSTEADY FLOW