Abstract
Trains running on a bridge face more significant safety risks. Based on the Unsteady Reynolds-Averaged Navier–Stokes turbulence model, a three-dimensional Computational Fluid Dynamics computational model of the train–bridge–wind barrier was proposed in this study to measure the transient aerodynamic load of the train. The transient aerodynamic load was input into the wind–train–bridge coupling dynamic system to perform dynamic analysis of running safety. Significant fluctuations in the aerodynamic coefficients were found when the train entered and exited the wind barrier due to the dramatic change in flow pattern. The maximum value of the derailment coefficient decreased with the height of wind barriers, which hardly affected the wheel load reduction rate. The 2 m high wind barrier had no evident influence on the running posture of a general high-speed train, while the 4 m high wind barrier was proven to have better protection. Over-protection was found with an even higher wind barrier.
Highlights
Trains play an increasingly important role in passenger and freight transportation as a vehicle of high-speed and cost-effective public transportation
The transient aerodynamic load during the passing was inputted into the train–bridge coupled dynamic system to realize a dynamic analysis of running safety
No noticeable difference in the wheel load reduction rate (WLRR) value was found when the train ran on a bridge with a wind barrier at different heights
Summary
Trains play an increasingly important role in passenger and freight transportation as a vehicle of high-speed and cost-effective public transportation. In the bridge-tunnel portion, the effects of a wind barrier with a height of 3 m and a porosity of 30% on the aerodynamic coefficient, flow field structure, and running protection of high-speed trains under crosswind were investigated. Deng discovered that when trains pass into a tunnel under crosswind, transient changes in the flow field structure and aerodynamic characteristics occur, reducing running safety [18] These studies are focused on a dynamic model based on a moving train, most of them are concerned with the train’s transient degradation of aerodynamic performance as it passes through various surrounding scenes. From the perspective of the train’s aerodynamic coefficient and flow field structure, the process and effect of the wind barrier height on the sudden change in aerodynamic performance of high-speed trains (HSTs) running on the bridge were investigated.
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