Numerical Investigation of Ice Accretion Effects at Supercooled Large Droplet Conditions

Abstract

The icing with supercooled large droplet (SLD) can form the complex ice downstream of the deicing boots. Ice accretion due to the SLD may result in extremely severe performance degradation to hazard the flight safety. In this paper a numerical solver is developed to investigate the ice accretion, which includes the centered finite volume method for solving the N-S equations to get the air flow field, and the Lagrangian method for predicting the flow field of droplets, and a revised Messinger model for simulating the thermodynamic process of icing. Considering the SLD conditions, we investigate the droplet deformation and breakup using Taylor analogy breakup method. A splashing model is presented to analyze the splashing phenomenon and the droplet impact. And the Langmuir D distribution is studied to get the impact characteristics and icing result of multi-scale distribution of large droplets. Using the above methods, we complete the numerical simulation of ice accretion and icing effects at the supercooled large droplet conditions over the NACA 0012 airfoil. The calculation results are in good agreement with experimental data. The investigation has important engineering application value for the icing prediction of the SLD.