The Influence of Affiliated Components and Train Length on the Train Wind

Guo, D.; Keming, S.; Zhang, Y.; Yang, G.; Sun, Z.

doi:10.4203/ccp.110.47

Cited by 1 publication

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“…The value is 0.1037 in 3 cars, 0.0951 in 8 cars, and C P is reduced by 8.3%. This trend is similar with the upper surface pressure, because the boundary layer development is dominant in both the upper and side areas of the train [ 12 ].…”

Section: Resultssupporting

confidence: 55%

“…They found that the momentum thickness increased along the length of the train, and the side momentum thickness was sensitive to the distance above the ground. Guo et al [ 12 ] used the improved delayed detached eddy simulation (IDDES) to study the influence of train length on the train wind. They found that bogies and bogie cabins strengthened the train wind near the ground, the train wind increased with the increasing length of the train, while the transverse train wind was not affected.…”

Section: Introductionmentioning

confidence: 99%

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Numerical calculation of boundary layers and wake characteristics of high-speed trains with different lengths

2017

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Trains with different numbers of cars running in the open air were simulated using the delayed detached-eddy simulation (DDES). The numbers of cars included in the simulation are 3, 4, 5 and 8. The aim of this study was to investigate how train length influences the boundary layer, the wake flow, the surface pressure, the aerodynamic drag and the friction drag. To certify the accuracy of the mesh and methods, the drag coefficients from numerical simulation of trains with 3 cars were compared with those from the wind tunnel test, and agreement was obtained. The results show that the boundary layer is thicker and the wake vortices are less symmetric as the train length increases. As a result, train length greatly affects pressure. The upper surface pressure of the tail car reduced by 2.9%, the side surface pressure of the tail car reduced by 8.3% and the underneath surface pressure of the tail car reduced by 19.7% in trains that included 3 cars to those including 8 cars. In addition, train length also has a significant effect on the friction drag coefficient and the drag coefficient. The friction drag coefficient of each car in a configuration decreases along the length of the train. In a comparison between trains consisting of 3 cars to those consisting of 8 cars, the friction drag coefficient of the tail car reduced by 8.6% and the drag coefficient of the tail car reduced by 3.7%.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%