Fluidic Diverter Controlled by Surface Jet Arrays
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Toth, Barnabas
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Abstract
The surface boundary layer upstream of airframe-embedded engine inlets of modern aircraft can adversely affect the pressure recovery, distortion, and stability of the flow within the inlet systems. While boundary layer diverters that have been employed upstream of the propulsion inlets to effect thin inlet boundary layers are attractive because of their robustness, they can add significant drag and weight and are difficult to integrate. In addition, diverterless supersonic inlets (DSI) have a limited effective Mach number range. An alternative, promising approach for handling the surface boundary layer at the inlet is based on Fluidic Diverters (FDs) that use arrays of surface jets to actively transport streamwise momentum from the cross flow into the wall layer. These fluidic systems lead to minimal drag and weight penalties, as well as adjustable control throughout the flight envelope to maximize efficiency. The current investigation focused on interactions between inclined and yawed single jets and jet arrays with a subsonic turbulent boundary layer over a flat plate, with emphasis on the formation mechanisms of surface bound streamwise vortices, that lead to cross stream and transverse transport of streamwise momentum. Variation in spanwise and cross stream momentum distributions was investigated using several configurations of jet arrays with varying yaw angles. The investigations explore parameters and flow mechanisms of a Fluidic Diverter that can lay the foundation for future simulations and system level optimization.
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2026-05
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Text
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Thesis (Masters Degree)