A new type of insulator for catenary cantilever is designed to solve the problem of large area pollution flashover over Lanzhou-Xinjiang high speed railway in the salt lake wind area of Dabancheng. According to the complex electromagnetic field theory and computational fluid dynamics theory

we developed a wind tunnel contaminated simulation model of equal proportion insulator based on the electric field

flow field

particle trace field

and the multi-physical field of interaction between fluid and particle single-phase coupling by using the COMSOL Multiphysics. Taking collision coefficient and distribution coefficient as characterization parameters

we analyzed the contamination characteristics of insulator under different air flow angles. The results show that the collision coefficient of the insulator surface increases with the increase of particle size

at the same particle size

the distribution coefficient of the sheds surface conforms to the normal "γ" distribution

and the distribution coefficient of stick and end fittings conforms to the inverted "γ" distribution when the air flow angle changes from 0° to ±45°. A new type of insulator with booster sheds is installed at the turning point of electric field strength

which can effectively reduce the collision coefficient and collision mass on the insulator surface

improve the anti-pollution ability

and provide a reference for insulator selection in extreme harsh environments.