Fuel Diffusion Immediately behind a Finite-Width Wedge within Supersonic Boundary Layer

First Report : Effect of Single Wedge

Abstract

SCRAM jet fuel sinking within compressible turbulent boundary layer was difficult to contribute to efficient thrust production. Then, the aerodynamic instability induced by a low-height wedge named Single-Wedge, which is composed of vertical sidewalls and a vertical backwall, installed on combustor wall was adopted for the passage height recovery of fuel tube being attached to the wall. It was attempted that the three-dimensional complicated flow induced around sidewall of the wedge raises the fuel tube toward supersonic airstream, immediately behind the wedge the mixing state of fuel was experimentally confirmed and the flow structure in the wake was numerically clarified. Since the relatively thick boundary layer inhibited the development of vortical motion in the airstream and confined the fuel tube to the wake flow of the wedge, the fuel-air diffusion progressed only in the horizontal direction with the appearance of two fuel tubes divided by an unique separated airstream from the top of the wedge but the achievement of vertical penetration was insufficient.