Stability and Transition on Swept Wings.

Abstract : The thrust of this research program has been the improvement of our capabilities for analyzing stability and transition in compressible boundary-layers as they appear in technologically important flows. Examples of such flows are swept wings of commercial airplanes or the highly cambered blades of gas turbines. We have extended the parabolized stability equations (P SE) for these situations and developed methods for solving these equations in disturbance environments reaching from the low atmospheric levels to the volatile high levels in gas turbines. The extension required both a basic study on the stability analysis of 3D flows and formulating the equations in general curvilinear coordinates. Proper choices have been made to minimize the effect of the parabolization. Major efforts have been spent on characterizing the disturbance environment. More recently, emphasis has been directed toward the control of stability and transition using neural networks.

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