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- W1665643456 abstract "In molecular systems such as mixing gasdynamic lasers (MGDLs), where inversions are produced by the selective thermal excitation of the pumping components, the final state of the laser mixture in the cavity is strongly influenced by 1) the choice of initial conditions, 2) the nozzle and mixing region geometry, and 3) the rate at which relaxation phenomena occur in the flow upstream of the cavity. The final state of such a molecular system can be described by using a kinetic relaxation model and a suitable (instantaneous, laminar, or turbulent) model to account for mixing effects. Such an approach has been taken in the present work. The parabolic approximation of the steady-state Navier-Stokes equations is used to described the two-dimensional flow of a CO2 + N2 + He mixture. Turbulent transfer of mass, momentum, and energy is described using the twoparameter k-e approach generally used for boundary-type flows. The influence of spatial pressure gradients on mixing is analyzed and a discussion of the role played by the pressure and translational temperature recovery effects is presented. Calculations of the gain coefficients are also included. The importance of the choice of initial conditions (velocities, preturbulence levels, concentrations, and temperature) is investigated. The results are compared with experimental data. The model can be used to select the range of conditions necessary to optimize the system." @default.
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- W1665643456 date "1981-01-01" @default.
- W1665643456 modified "2023-10-05" @default.
- W1665643456 title "Modeling of Gasdynamic and Relaxation Phenomena in Mixed Flow Lasers" @default.
- W1665643456 cites W2145598491 @default.
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- W1665643456 doi "https://doi.org/10.2514/5.9781600865503.0046.0074" @default.
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