Measurement of Flow-Induced Surface Displacement on a Compliant Surface by Optical Holographic Interferometry.

摘要

Flow-induced surface displacements that form on a single-layer passive isotropic viscoelastic compliant surface as a result of the interaction with a turbulent boundary layer are measured by non-intrusive optical holographic interferometry in connection with an interactive fringe-processing system. Specific topographic features of a large section of the compliant surface are obtained in the form of interferometric fringe patterns. Information about the dimensions of the 'foot prints' or the surface displacements of the turbulence on the compliant surface are presented in the form of line contours and isometric phase maps. These experimental data are essential in order to determine statistical measures of the random topography of the compliant surface. Furthermore, by coupling with the simultaneous measurements of the turbulence field, the physics of the alteration of the turbulent boundary layer by the undulating surface can then be better understood.