Study on the Effect of Acceleration on the Surface Flow Field Distribution Characteristics of Roof Insulator of High-Speed Railway

Abstract

It is easy to cause insulation flashover outside the roof when the high-speed railway is started or braked. The possible reason for this phenomenon is that the insulator surface flow field characteristics have changed significantly during the high-speed railway is started or braked, resulting in insulation flashover. In order to find out the influence of high-speed railway starting or braking on the surface flow field of roof insulator, this paper uses the finite element method to analyze the surface flow field of high-speed railway roof insulator, and explores the distribution of surface flow field of roof insulator under different accelerations. The distribution law of the surface flow field of high-speed rail roof insulator under different acceleration directions is analyzed, and the flow field distribution law under acceleration conditions and constant speed conditions is compared and analyzed. The simulation results show that: Compared with the case of constant speed, the difference of air velocity distribution on insulator surface under acceleration is greater, and the difference of air velocity distribution on insulator surface under negative acceleration is even 1.86 times that under constant speed. The research results provide a reference for exploring the flow field distribution law and flashover mechanism of high-speed rail roof insulators.