Physics of Supersonic Mixing in Parallel and Non-Parallel Streams Passing Over Base Thickness

Abstract

The mixing flow field of two-parallel and non parallel gaseous streams has been studied numerically. The streams are of air and hydrogen and come into contact after passing over a finite thickness base. The two gas streams are delivered from a high-pressure reservoir and entering into the domain with atmospheric pressure. The two-dimensional unsteady Navier-Stokes equations, energy, mass diffusion and species continuity equations are numerically simulated to analyze the mixing layer in supersonic flow field. An explicit Harten-Yee Non-MUSCL Modified flux-type TVD (total variation diminishing) scheme is used to solve the system of equations. An algebraic turbulence model is used to calculate the eddy viscosity coefficient. Keeping constant the inlet pressure and velocity of the streams, the merging angle is varied to observe the physics of flow fields, mixing of two-streams and mixing efficiency. The results show that the increase of merging angle causes stronger interactions between two streams, high momentum exchange and eventually enhancement of mixing between two streams.