Study on the Aerodynamic Performance of the High-Speed Train Head with Symmetrical and Asymmetric Nose Shape

Abstract

This study focused on the use of mesh morphing on optimizing high-speed train shape. Three shape variables were studied in this paper: the angle of cab-window, length of train-nose and width of train-nose. The original high-speed train head was optimized in symmetrical and asymmetric deformation. Total drag coefficient and lift coefficient of head car and tail car were optimized using Kriging model and NSGA- Ⅱ. As a result, three objective aerodynamic performance of the optimal train in symmetrical deformation is slightly improved comparing with the original ones and that in asymmetric deformation is improved significantly. Also, results of the symmetrical and asymmetric optimized high-speed train running in different speed were compared with that of the original high-speed train. Proposed method in this paper has been proved to be an efficient and feasible approach to study and optimize the aerodynamic performance of different high-speed trains as well as other structures.