Turbulent Boundary-layer Separation Induced by Flares on Cylinders at Zero Angle of Attack

Turbulent Boundary-layer Separation Induced by Flares on Cylinders at Zero Angle of Attack
Author: Donald M. Kuehn
Publisher:
Total Pages: 36
Release: 1961
Genre: Noses (Space vehicles)
ISBN:

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Separation caused by the pressure rise induced by flares has been experimentally investigated in the Mach number range of 1.5 to 5.0 and in the Reynolds number range (based on boundary-layer thickness) of 1.5X104 to 12X104. The purpose of the investigation was to determine the model geometry and flow conditions for which separation can be expected for a turbulent boundary layer of zero pressure gradient on the cylinder approaching the flare. Comparisons are made of the boundary-layer-separation characteristics of these three-dimensional flares with two-dimensional separation results from a previous investigation.

Experimental Investigation of Turbulent Step-induced Boundary-layer Separation at Mach Numbers 2.5, 3, and 4

Experimental Investigation of Turbulent Step-induced Boundary-layer Separation at Mach Numbers 2.5, 3, and 4
Author: Jerry S. Hahn
Publisher:
Total Pages: 39
Release: 1969
Genre:
ISBN:

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An experimental investigation of turbulent separated boundary-layer flow was conducted using high forward-facing steps (with side plates) mounted on a flat plate at zero angle of attack. The tests were made at Mach numbers of 2.5, 3.0, and 4.0 for Reynolds numbers, based on the boundary-layer total thickness at the separation location, from 100,000 to 150,000. The effects of Mach number, step height and span, end plates, and step-face fairings were investigated. Data are presented graphically and in tabulations and include model surface pressures on the flat plate and on the face and top of selected steps, boundary-layer Mach number profiles, and selected oil dot photographs. (Author).