Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit ( IF 2 ) Pub Date : 2022-07-18 , DOI: 10.1177/09544097221116551 Houyu Gu, Tanghong Liu, Hongrui Gao, Zhiqi Liu, Sijin Cheng
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.
中文翻译:
不同长度单面和双面风障列车气动效应风洞试验
本研究通过风洞试验研究了风障长度变化对单面和双面风障列车气动性能的影响。结果表明,在双面风障条件下,随着风障长度的增加,列车迎风侧的压力变化明显小于单面风障。当风障长度小于21.67H(H为列车高度)时,在两种风障条件下,侧向力系数方向与来流方向相反。随着风障长度的变化,双面风障的阻力系数明显比单面风障稳定。对于阻力系数和升力系数,在双面风障条件下,当风障长度大于23.65 H时,变化幅度小于单面风障。为保证列车运行安全,单边护栏长度为25.63 H,双面护栏长度为23.65 H,保守且近似准确。