Abstract
The impinging mass flux distribution which determines aircraft ice accretion rate is shown to be related to the atmospheric droplet size distribution through the droplet collection efficiency of the body. Collection efficiency is studied by means of a two-dimensional droplet trajectory code which includes the effect of nonspherical droplet shape due to hydrodynamic deformation. The simulation was found to agree with wind tunnel photographic studies of droplet kinematics. The results of the simulation are used to generate impinging mass flux distributions for typical cloud and precipitation size distributions. The impinging mass approach is also used to determine relative icing rates from several supercooled cloud characterizations including the intermittent maximum icing envelope of Federal Aviation Regulation, Part 25.
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