Parameter optimization for improved aerodynamic performance of louver-type wind barrier for train-bridge system

Abstract

To improve the safety of trains running in an undesirable wind environment, a novel louver-type wind barrier is proposed and further studied in this research using a scaled wind tunnel simulation with 1:40 scale models. Based on the aerodynamic performance of the train-bridge system, the parameters of the louver-type wind barrier are optimized. Compared to the case without a wind barrier, it is apparent that the wind barrier improves the running safety of trains, since the maximum reduction of the moment coefficient of the train reaches 58% using the louver-type wind barrier, larger than that achieved with conventional wind barriers (fence-type and grid-type). A louver-type wind barrier has more blade layers, and the rotation angle of the adjustable blade of the louver-type wind barrier is 90–180° (which induces the flow towards the deck surface), which is more favorable for the aerodynamic performance of the train. Comparing the 60°, 90° and 120° wind fairings of the louver-type wind barrier blade, the blunt fairing is disadvantageous to the operational safety of the train.

Keywords

wind barrier / aerodynamic force / train-bridge system / scaled wind tunnel simulation / parameter optimization

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