Research on Probabilistic Adhesion and Resuspension Model between articles and Composite Insulator under High-speed Environment

With the wide use of composite insulators in high speed railway system, it is of great significance to deeply explore its contamination mechanism under high speed environment. Base on the theory of fluid mechanics and contact mechanics, an insulator contamination accumulation model considers coupling of surface roughness, fluid field, and particle probabilistic resuspension is established. At the same time, taking post composite insulator as an simulation object, the rationality of the model is verified by comparing the simulation results with experimental results from the aspects of surface contamination distribution under 55m/s wind speed environment in wind tunnel. The results show that due to the low hardness and high surface energy of silicon rubber, the adhered particles will not resuspend when the wind speed is less than 20 m/s. However, under the extremely high speed environment, the particle resuspension phenomenon will become very common which must be taken into consideration.