Accession Number : ADA302636

Title :   Stability and Transition on Swept Wings.

Descriptive Note : Final rept.,

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Herbert, Thorwald

PDF Url : ADA302636

Report Date : MAR 1994

Pagination or Media Count : 61

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.

Descriptors :   *AERODYNAMIC STABILITY, *SWEPT WINGS, *BOUNDARY LAYER TRANSITION, HEAT TRANSFER, MATHEMATICAL MODELS, ALGORITHMS, NEURAL NETS, OPTIMIZATION, ACCURACY, VORTICES, COMPUTATIONAL FLUID DYNAMICS, FINITE DIFFERENCE THEORY, GAS TURBINES, COMPRESSIBLE FLOW, FLOW FIELDS, APPROXIMATION(MATHEMATICS), HYDRODYNAMIC CODES, UNSTEADY FLOW, NAVIER STOKES EQUATIONS, INVISCID FLOW, PRESSURE DISTRIBUTION, INCOMPRESSIBLE FLOW, BOUNDARY LAYER CONTROL, CROSS FLOW, THREE DIMENSIONAL FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE