Laser interferometer skin-friction measurements of crossing-shock-wave/turbulent-boundary-layer interactions

Wall shear stress measurements beneath crossing-shock-wave/turbulent boundary-layer interactions have been made for three interactions of different 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 interferometer skin-friction meter, a device that determines the wall shear by optically measuring the time rate of thinning of an oil film placed on the test model surface. Results of the measurements reveal high skin-friction 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 A>£ model, are compared with the experimental results for the Mach 3.85,15-deg interaction case. Although the A>e model did a reasonable job of predicting the overall trend in portions of the skin-friction distribution, neither computation fully captured the physics of the near-surface flow in this complex interaction.

[1]  J. Szodruch,et al.  Application of a laser interferometer skin-friction meter in complex flows , 1981 .

[2]  G. Settles,et al.  Skin friction measurements by laser interferometry in swept shock/boundary-layer interactions , 1990 .

[3]  Doyle Knight,et al.  Investigation of a hypersonic crossing shock wave/turbulent boundary layer interaction , 1993 .

[4]  Gary S. Settles,et al.  Supersonic and hypersonic shock/boundary-layer interaction database , 1994 .

[5]  P. Batcho,et al.  Preliminary study of the interactions caused by crossing shock waves and a turbulent boundary layer , 1989 .

[6]  Doyle Knight,et al.  Asymmetric Crossing-Shock-Wave/Turbulent-Boundary-Layer Interaction , 1995 .

[7]  G. Settles,et al.  Flowfield visualization of crossing shock-wave/boundary-layer interactions , 1992 .

[8]  D. Knight,et al.  Numerical simulation of crossing/turbulent boundary layer interaction at Mach 8.3 comparison of zero and two-equation turbulence models , 1993 .

[9]  G. S. Settles,et al.  Skin-friction measurements by laser interferometry , 1989 .

[10]  W. D. Bachalo,et al.  Improved skin friction interferometer , 1986 .

[11]  Doyle Knight,et al.  Structure of crossing-shock-wave/turbulent-boundary-layer interactions , 1993 .

[12]  Gary S. Settles,et al.  Flow visualization methods for separated three-dimensional shock wave/turbulent boundary-layer interactions , 1983 .

[13]  L. Tanner,et al.  A study of the motion of oil films on surfaces in air flow, with application to the measurement of skin friction , 1976 .

[14]  D. J. Monson,et al.  Skin Friction Measurements by a Dual-Laser-Beam Interferometer Technique , 1981 .

[15]  Raymond J. Stalker,et al.  Glancing interactions between single and intersecting oblique shock waves and a turbulent boundary layer , 1986, Journal of Fluid Mechanics.

[16]  Kwang-Soo Kim,et al.  Skin-friction measurements and computational comparison of swept shock/boundary-layer interactions , 1991 .

[17]  D. J. Monson.  A nonintrusive laser interferometer method for measurement of skin friction , 1982 .

[18]  C. Sun,et al.  A modified wall wake velocity profile for turbulent compressible boundary layers. , 1973 .

[19]  L H Tanner.  A skin friction meter, using the viscosity balance principle, suitable for use with flat or curved metal surfaces (based on thickness measurement) , 1977 .