Research on the Aerodynamic Performance of the External Windshield of High-Speed Trains Operating on Open Lines

Abstract

Abstract The proportion of aerodynamic resistance in train operation resistance is increasing as the speed of the train continues to increase. A streamlined front can reduce train running resistance effectively. Windshields and pantographs cause sudden changes in the geometric shape of the train's longitudinal section also have a significant impact on train running resistance. High-speed trains generally use external windshields, which can reduce the impact of sudden changes on the running resistance to geometric shape of the train end connection. The article constructs a 3-group calculation model based on the true geometric shape of high-speed trains to study the aerodynamic drag reduction effect of the external windshield with three-dimensional, steady, incompressible N-S equations and k-ε are adopted to calculate the flow field distribution and pressure distribution of the external windshield of trains operating on open lines at a speed of 250km/h, 300km/h, 350km/h, 400km/h or 450km/h separately. The aerodynamic resistance and lift of the external windshield were fitted, although the train operating speed changed, it was a variation curve.