Abstract
Flow-induced surface displacements that form on a singlelayer 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. The purpose for developing this method is to obtain the instantaneous topographic features of a whole field of the displacements of the compliant surface. Information about dimensions of the “foot prints” of the turbulence on the compliant surface are obtained 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.
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Abbreviations
- A :
-
light amplitude
- A 0 :
-
light amplitude of object beam
- A r :
-
light amplitude of reference beam
- c :
-
light speed
- d e :
-
diameter of laser beam
- d p :
-
diameter of pinhole
- d s :
-
spatial frequency
- E :
-
exposure energy
- f :
-
focal length
- I in :
-
light intensity at photographic plate
- I 0 :
-
light intensity of object beam
- I r :
-
light intensity of reference beam
- k :
-
wave number, 2 π/λ
- L in :
-
light amplitude records on the emulsion surface
- L 0 :
-
light ray of object beam
- L r :
-
light ray of reference beam
- R θ :
-
Reynolds number based on momentum thickness, V ∞ θ/ν
- t :
-
time
- t e :
-
exposure time
- T 0 :
-
uniform background light transmittance
- T re :
-
reconstructed light through hologram
- T t :
-
amplitude transmittance of hologram
- V ∞ :
-
freestream flow speed
- ω :
-
radian frequency, k c
- x :
-
distance from the leading edge of the flat plate
- z :
-
position
- β :
-
slope
- δ :
-
optical path difference
- φ :
-
phase
- φ 0 :
-
phase of object beam
- φ r :
-
phase of reference beam
- λ :
-
wavelength
- θ :
-
momentum thickness
- θ 0 :
-
angle between the object beam with respect to the normal of the photographic plate
- θ r :
-
angle between the reference beam with respect to the normal of the photographic plate
- ν :
-
kinematic viscosity of water
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Lee, T., Fisher, M. & Schwarz, W.H. The measurement of flow-induced surface displacement on a compliant surface by optical holographic interferometry. Experiments in Fluids 14, 159–168 (1993). https://doi.org/10.1007/BF00189506
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DOI: https://doi.org/10.1007/BF00189506