Numerical simulation of the steady mixing of pressure-unmatched jets with allowance for nonequilibrium processes

The paper presents a numerical analysis of laminar mixing in a two-dimensional system of supersonic reactive jets of F and H2 on the basis of a system of simplified Navier-Stokes equations, with application to a chemical HF laser of diffusion type. An algorithm for performing calculations in the lasing mode is presented, and an analysis is made of the hydrodynamic characteristics of cavity flow in pressure-unmatched regimes. It is shown that the specific energy output and the length of the lasing zone depend strongly on pressure in the F and H2 jets. It is noted that the proposed method makes it possible to carry out calculations in a wide range of regime-parameter values and to obtain sufficiently accurate results with relatively small machine-time expenditures.