Relative efficiencies for parallel and perpendicular entrainment flow paths

The relative efficiency of parallel and perpendicular flow paths for a high-speed or primary flow with a defined entrainment flow rate delivered to a shear layer through a rectangular passage is found to be characterized by the relative plenum pressure to deliver the designated flow rate, and the relationship between one-stream and two-stream layers is explored. For the same mass flux, the increased plenum pressure in the parallel case accounts for the larger kinetic energy flux as compared with the perpendicular case.