Skin-friction measurements in a 3-D, supersonic shock-wave/boundary-layer interaction

Abstract

The experimental documentation of a three-dimensional shock-wave/boundary-layer interaction in a nominal Maeh 3 flow is presented. The model consisted of a sting-supported cylinder, aligned with the free-stream flow, and a 20°half-angle conical flare offset 1.27 era from the cylinder centerline. Surface oil flow, laser light sheet illumination, and schlieren were used to document the flow topology. The data includes surface-pressure and skin-fi'iction measurements. A laser interferometric skin friction instrument was employed to acquire the skin-friction data. Included in the skin-friction data are measurements within separated regions and threedimensional measurements in highly-swept regions. The skin-friction data will be particularly valuable in turbulence modeling and computational fluid dynamics validation. Cf C1,2,3 h ki Moo

Progress in shock wave/boundary layer interactions

“…The experiments and simulations are discussed in Refs. [17,84] respectively. Again, the surface oil flow, pressure and overall flow structure (but not C f ) are accurately reproduced by RANS methods and careful analysis of the computed flow reveals a vortical structure whose legs wrap around the cylinder-flare juncture before being vented downstream as shown in Fig.…”

“…A few representative articles may be found in Refs. [13][14][15][16][17][18]. The nominally 2-D configurations comprised of impinging shocks ( Fig.…”

“…Three-dimensionality can be introduced into axisymmetric situations with angle of attack or for example as in Ref. [17] by off-setting the axis of one component relative to the other. The internal flow situation ( Fig.…”

Structure of a Supersonic Three-Dimensional Cylinder/Offset-Flare Turbulent Interaction

“…For comparison, the numerical designation of the critical points closely follows that of the experimentalists. 16 Thus, gaps in the notation correspond to features that are postulated in the experimental sketch but are not observed in the computation.…”

“…In contrast, this separation line appeared in some runs to proceed into the upstream focus N2." 16 Although this aspect of the comparison clearly deserves additional work, for the present it is assumed that the computed structure is a kinematic truncation 5 of the experimentalobservation.As noted in Ref. 5, isolated singular points occurring closely together take on the character of a simpler con guration if viewed on a large scale.…”