Wind tunnel testing on the aerodynamic effect on a train with single-sided and double-sided wind barriers of different lengths

Abstract

In this study, wind tunnel tests were used to study the effect of changes in the length of a wind barrier on the aerodynamic performance of a train with single-sided and double-sided wind barriers. The results showed that in the condition of a double-sided wind barrier, as the length of the wind barrier increased, the pressure change on the windward side of the train was significantly smaller than that of the single-sided wind barrier. When the length of the wind barrier is less than 21.67 H (H is the height of the train), in the condition of the two types of wind barrier, the direction of the side force coefficient is opposite to the direction of the incoming flow. As the length of the wind barrier changes, the drag coefficient with the double-sided wind barrier is obviously more stable than that with the single-sided wind barrier. For the drag coefficient and lift coefficient, under the condition of double-sided wind barrier, when the length of the wind barrier is greater than 23.65 H, the change amplitude is lower than that of the single-sided wind barrier. For the running safety of the train, it is conservative and approximately accurate at the single-sided barrier length of 25.63 H and double-sided barrier length of 23.65 H.