Stability and Transition of Hypersonic Boundary-Layer Flows
ARIZONA STATE UNIV TEMPE
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This Final Report describes our research of hypersonic and supersonic boundary-layer flows. In spite of its extreme importance to the accurate prediction of drag and heating requirements in high-speed flow, the study of boundary-layer transition in hypersonic NASP and supersonic fighter and high-speed civil transport flows is still very much in its infancy. Transition is well known, however, to depend strongly on such effects as pressure gradient, wall curvature, sweep, roughness, wall mass transfer, freestream and wall temperature, nose radius, nonequilibrium chemistry, and freestream disturbances. These effects have been discussed in any number of workshops and U.S. Transition Study Group meetings under the direction of Eli Reshotko. We have completed detailed studies of the stability of the laminar basic state of 2-D and axisymmetric boundary layers with non-equilibrium chemistry included and 3-D boundary-layer flows of an ideal gas. Relatively simple geometries were considered due to the anticipated difficulties in performing basic-state analyses.
- Research and Experimental Aircraft