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Investigation of supercooled water droplet sticking efficiency during power transmission line icing using digital holography
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DOI：10.5194/amt-19-4491-2026.png)
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Abstract
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Abstract. Transmission line icing severely threatens the safety of the power grid. Accurate prediction of the sticking efficiency (the proportion of supercooled droplets that remain on the conductor after impact; excluding bouncing and splashing) is critical for preventing and mitigating icing disasters. Traditional prediction models for sticking efficiency typically exhibit significant errors under complex conditions (e.g.; varying wind speeds and precipitation intensities); thereby limiting their practical applications. To overcome this limitation; a two-stage coupled model based on coaxial digital holography was proposed. In this model; the diameters; velocities; and collision angles of supercooled droplets were accurately measured and incorporated into a two-stage framework that couples droplet impact dynamics with thermodynamic processes to calculate sticking efficiency. For the laboratory and field-validation cases examined in this study; the prediction errors of the proposed model remained below 3.5 % under various conditions; representing a significant improvement over traditional models and underscoring its enormous potential in engineering applications.
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