FLOW CHARACTERISTICS OF TWO NON-PARALLEL STREAMS BEHIND A FINITE THICKNESS BASE

The objectives of this study are to observe the mixing of subsonic hydrogen flow with supersonic airflow, characteristic phenomena of the flowfield, mixing efficiency and flame holding capability of a supersonic combustor. Two non-parallel streams are considered for this study where merging angle is varied. This numerical study has been performed by solving Two-Dimensional Navier-Stokes equations. An explicit Harten-Yee Non-MUSCL Modified -Flux-Type TVD (Total Variational Diminishing) scheme has been used to solve the system of equations, and a zero-equation algebraic turbulence model proposed by Baldwin and Lomax has been used to calculate the eddy viscosity coefficient. To delineate the purely fluid dynamic effects, the flow has been treated as non-reacting. It has been seen that recirculation and penetration of hydrogen play an important role to enhance mixing. The area of recirculation decreases with the increase of merging angle but mixing efficiency increases. The recirculation regions and several shocks such as expansion shock, recompression shock and reattachment shock in the flowfield are evident.