Tj. Garrison et al., LASER INTERFEROMETER SKIN-FRICTION MEASUREMENTS OF CROSSING-SHOCK-WAVE TURBULENT-BOUNDARY-LAYER INTERACTIONS, AIAA journal, 32(6), 1994, pp. 1234-1241
Wall shear stress measurements beneath crossing-shock-wave/turbulent b
oundary-layer interactions have been made for three interactions of di
fferent strengths. The interactions are generated by two sharp fins at
symmetric angles of attack mounted on a flat plate. The shear stress
measurements were made for fin angles of 7 and 11 deg at Mach 3 and 15
deg at Mach 3.85. The measurements were made using a laser interferom
eter skin-friction meter, a device that determines the wall shear by o
ptically measuring the time rate of thinning of an oil film placed on
the test model surface. Results of the measurements reveal high skin-f
riction coefficients in the vicinity of the fin/plate junction and the
presence of quasi-two-dimensional flow separation on the interaction
centerline. Additionally, two Navier-Stokes computations, one using a
Baldwin-Lomax turbulence model and one using a k-epsilon model, are co
mpared with the experimental results for the Mach 3.85, 15-deg interac
tion case. Although the k-epsilon model did a reasonable job of predic
ting the overall trend in portions of the skin-friction distribution,
neither computation fully captured the physics of the near-surface now
in this complex interaction.