Analysis of Aerodynamic Drag Coefficient of the Train in Tunnel

Research purposes: With the increase of the train running speed, aerodynamic drag will become the main role resulting in energy consumption. While train running in tunnel, the energy consumption of aerodynamic drag will enhance remarkably. In this paper, using three-dimensional model, based on LES (large eddy simulation) turbulence model, the aerodynamic drag characteristic of CRH3 train model was analyzed.Research conclusions: (1) The aerodynamic drag coefficients of the train running in the open air were obtained. By comparing the results with Japanese test data, the applicability of the numeral calculating method was verified. (2) The aerodynamic drag coefficients of train running in tunnel with different blocking ratios were obtained. By regression analysis of the data, the aerodynamic drag coefficients relationship with blocking ratios of tunnels was obtained, which shows that the aerodynamic drag coefficients have exponential function relationship with blocking ratios of tunnels, and the prediction formula was put forward. (3) Using the formula put forward in this paper, the aerodynamic drag coefficients of dual-head train running in tunnel were anticipated and the evacuated tube parameters design on the basis of equal aerodynamic drag was analyzed, which verified its reliability and practicability. (4) The research result can provide guidance for relevant analysis and design on aerodynamic drag coefficient of the train in tunnel. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.