Diffuser with boundary layer control

Claim 1

IN AN INTAKE DUCT FOR AN AIR CONSUMING MECHANISM SUCH AS AN AXIAL FLOW DEVICE, MEANS FOR MOVING THE AIR THROUGH THE DUCT INCLUDING A DIFFUSER ADJACENT THE DOWNSTREAM END THEREOF, SAID DIFFUSER INCLUDING A LONGITUDINAL AXIS AND COMPRISING AT LEAST AN OUTER WALL PORTION SUBSTANTIALLY ARCUATE IN CROSS SECTION AND DIVERGING IN A DOWNSTREAM DIRECTION AND FORMING AN ABRUPTLY CONTINUOUSLY INCREASING CROSS-SECTIONAL AREA WHEREBY ADVERSE PRESSURE GRADIENTS ARE INTRODUCED IN THE FLOW STREAM THROUGH THE DUCT AS A RESULT OF THE DECREASING VELOCITY AND INCREASING PRESSURE, MEANS FOR ENERGIZING SUBSTANTIALLY ONLY THE BOUNDARY LAYER MOVING ADJACENT ALONG SAID WALL PORTION COMPRISING A PLURALITY OF RELATIVELY SMALL EJECTING PASSAGE MEANS IN SAID WALL PORTION FOR INJECTING SECONDARY FLUID INTO SAID BOUNDARY LAYER IN A MULTIPLICITY OF RELATIVELY HIGH ENERGY STREAMS AND IN A DIRECTION TANGENTIALLY OF SAID ARCUATE WALL SECTION AND SUBSTANTIALLY ABOUT SAID AXIS TO INDUCE CENTRIFUGAL FORCES IN SAID BOUNDARY LAYER AND REDUCE THE ONSET OF SEPARATION IN SAID ABRUPTLY INCREASING CROSS SECTION.