Measurements of Water Droplet Movement in a Stagnation Point Boundary Layer
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Improving numerical simulations of aircraft ice accretion will require empirical data on the behavior of liquid water on rough wing surfaces under glaze icing conditions. Toward this end, the present work presents a technique that provides detailed, full-field droplet interface height measurements using laser speckle shift correlations. The technique consists of illuminating a rough surface with coherent laser light and measuring the deformation of the resulting speckle pattern when a water drop is present on the rough surface. Computer algorithms have been developed that recover and integrate the speckle shift field and provide the reconstructed the droplet profile. Preliminary results are presented and possibilities for future improvements are discussed.
