Accession Number : ADA137060

Title :   Three Dimensional/Boundary Layer Interaction: Laminar and Turbulent Behaviour.

Descriptive Note : Final scientific rept. 1 Dec 81-30 Nov 82,


Personal Author(s) : Ginoux,J J ; Degrez,G

PDF Url : ADA137060

Report Date : 15 Dec 1982

Pagination or Media Count : 65

Abstract : An experimental study of a 3D skewed shock wave laminar boundary layer interaction has been carried out. The test configuration was a flat/finned plat arrangement with sharp leading edge fins having 4, 6 and 8 deg incidence relative to the free stream. The flat plate laminar boundary layer had thickness between 1.1 and 2.2 mm depending on test conditions. The unit Reynolds numbers used were 1.2 million and 2.4 million. Experimental surface data represented as surface flow visualizations and pressure distributions are presented for all test conditions. All tests were carried out at a nominal free stream Mach number of 2.25 and under approximately adiabatic wall conditions. The experimental results indicate that extended separation occurs even for the smallest wedge incidence, i.e., for a pressure ratio of 1.27 and that the extent of upstream influence is much larger in this 3D interaction than in comparable 2D interactions. Preliminary theoretical investigations show that an integral method is not suited for the study of the present interaction. The new implicit corrected viscosity method for solving the compressible Navier-Stokes equations can yield convergence speeds of order unity under suitable chosen conditions. (Author)

Descriptors :   *Laminar boundary layer, *Shock waves, *Flow separation, Mathematical models, Model tests, Interactions, Supersonic flow, Three dimensional, Skewness, Turbulent flow, Free stream, Wedges, Flat plate models, Leading edges, Fins, Walls, Surfaces, Navier Stokes equations, Compressible flow, Pressure distribution, Flow visualization, Reynolds number, Wind tunnel tests, Belgium

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE