Accession Number:

ADA277563

Title:

Method for Transition Prediction in High-Speed Boundary Layers

Descriptive Note:

Final rept. 27 Sep 1990-27 Sep 1993

Corporate Author:

DYNAFLOW INC COLUMBUS OH

Personal Author(s):

Report Date:

1993-09-01

Pagination or Media Count:

103.0

Abstract:

The parabolized stability equations PSE are a new and more reliable approach to analyzing the stability of streamwise varying flows such as boundary layers. This approach has been previously validated for idealized incompressible flows. Here, the PSE are formulated for highly compressible flows in general curvilinear coordinates to permit the analysis of high-speed boundary-layer flows over fairly general bodies. Vigorous numerical studies are carried out to study convergence and accuracy of the linear-stability code LSH, and the linear nonlinear PSE code, PSH. Physical interfaces are set up to analyze the M8 boundary layer over a blunt cone calculated by using a thin-layer Navier Stokes TNLS code, and the flow over a sharp cone at angle of attack calculated using the AFWAL Parabolized Navier-Stokes PNS code. While stability and transition studies at high speeds are far from routine, the method developed here is the best tool available to research the physical processes in high-speed boundary layers. Parabolized stability equations, Compressible flows, High-speed boundary layers, General bodies

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE