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The calculation of impact characteristics of Supercooled Large Droplet (SLD) with complex three-dimensional(3D) configuration has always been a hot issue in the field of aircraft icing. The water droplet collection efficiency is a key parameter in numerical simulation of icing and deicing prevention, and an accurate evaluation of the water droplet collection efficiency is of great significance for icing analysis. In this paper, based on the Lagrangian method, an efficient method for calculating the SLD collection efficiency is developed that can be adapted to 3D complex configurations. In this method, the directional search algorithm is used to realize the rapid positioning of water droplets during their movement; The calculation of the impact characteristics of water droplets with complex 3D configurations is realized with the particle statistics method; And the deformation and breakage of SLD during movement are simulated with TAB model; The LEWICE splash model was used to simulate the splash effect of SLD behind the impactor surface, and the calculation of the secondary impact of sub-droplets was carried out. The effectiveness of the proposed method is verified by the numerical simulation of the SLD dynamic effect of a typical example, which is in good agreement with the calculation and experimental results of references. On this basis, the dynamic characteristics of SLD with 100μm particle size were calculated, and the results show that: The established calculation method can effectively adapt to the calculation of SLD collection efficiency of 3D complex configuration; The deformation and breakup of SLD mainly changed the trajectory of water droplets and the impact limit of water droplets; The splash of SLD mainly causes the mass loss of mother water droplets, the local water droplet collection efficiency decreases in splash area but increases in secondary collision area.
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