Effect of the outer windshield schemes on aerodynamic characteristics around the car-connecting parts and train aerodynamic performance

摘要

With the increasing speed of passenger trains, the train aerodynamics has deteriorated significantly. Abnormal vibration of windshield of the high-speed train occurred in the test of raising train speed to 350 km/h. To improve the design of a windshield with better aerodynamic performance, the aerodynamic performance of a high-speed train running at a speed of 350 km/h, especially the flow field around the windshields with six configurations, was investigated by numerical simulation and full-scale testing. The results show that the drag of the head car and tail car, and the lift force of the tail car are decreased by the most modified windshields, and the lift force of the head car is increased by the most modified windshields. Fluctuations of the drag and lift force of the tail car are reduced and increased by the modified windshields, respectively, and the effect of modified windshield on the fluctuation of the head car is confused. Vibration of the outer windshield is not suppressed, and even intensified by the modified windshields, and has no obvious relationship with windshield structure. (C) 2019 Elsevier Ltd. All rights reserved.