Photogrammetric measurements of frost roughness evolution on a cold-soaked wing tank model.


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An aircraft subjected to cold-soaked fuel frost (CSFF) on its wing surface is not allowed to take off without FAA certification because of aerodynamic performance degradation caused by frost accretion. A physical model of transient frost roughness on an aircraft wing was developed using a 3D photogrammetry technique. Experiments were carried out in an atmosphere-controlled wind tunnel climatic chamber where the wing-tank thermal model replicates the internal heat transfer to the surface. An automated photogrammetry method was employed in the test section and validated with two fabricated rough surfaces. In this study, the frost roughness evolution and the corresponding effects of atmospheric conditions were presented. The air velocity was found to have the most dominant effect on CSFF roughness evolution. Furthermore, the interaction effect of air velocity and air temperature at a certain condition is responsible for producing the most critical frost case in cold-soaked conditions.



Cold-soaked fuel frost. Frost roughness. Photogrammetry.