Regularity and sensitivity analysis of main parameters of plate effects on the aerodynamic braking drag of a high-speed train

With increase of train speed, braking plate technology has a good application prospect in the high-speed stage of the train. Based on the 1/8 scaled symmetrical train model composed of two half cars, the Reynolds Average Navier-Stokes (RANS) equations and Shear Stress Transfer (SST) k-omega turbulence model are adopted to simulate the aerodynamic performance of the train with plate. The aerodynamic drag dependence of single parameter of the plate (shape, area, angle, position and number) is analysed, and identification research of the main aerodynamic parameters of the plate is carried out. The numerical settings used in this paper are verified by wind tunnel test data. Results show that the braking plate with an aspect ratio of one has better performance on aerodynamic drag. The area, opening angle and number of plates are basically positively correlated with the total aerodynamic drag of the target car and plate. Arranging plates at the downstream of the vehicle is a good method of raising total aerodynamic drag. Within the range of plate parameter design in this paper, by using orthogonal design of experiment and the method of range analysis and analysis of variance, the influence degrees of plate parameters on aerodynamic drag are determined, and the order is number, area and opening angle of plate. The research results provide theoretical support for the design and safe operation of high-speed trains with aerodynamic braking plates.