Aerodynamic discrepancies of high-speed trains meeting within two types noise barriers: considering modeling scale ratio
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 25 July 2024
Issue publication date: 4 September 2024
Abstract
Purpose
Sustainable urban rail transit requires noise barriers. However, these barriers’ durability varies due to the differing aerodynamic impacts they experience. The purpose of this paper is to investigate the aerodynamic discrepancies of trains when they meet within two types of rectangular noise barriers: fully enclosed (FERNB) and semi-enclosed with vertical plates (SERNBVB). The research also considers the sensitivity of the scale ratio in these scenarios.
Design/methodology/approach
A 1:16 scaled moving model test analyzed spatiotemporal patterns and discrepancies in aerodynamic pressures during train meetings. Three-dimensional computational fluid dynamics models, with scale ratios of 1:1, 1:8 and 1:16, used the improved delayed detached eddy simulation turbulence model and slip grid technique. Comparing scale ratios on aerodynamic pressure discrepancies between the two types of noise barriers and revealing the flow field mechanism were done. The goal is to establish the relationship between aerodynamic pressure at scale and in full scale.
Findings
The aerodynamic pressure on SERNBVB is influenced by the train’s head and tail waves, whereas for FERNB, it is affected by pressure wave and head-tail waves. Notably, SERNBVB's aerodynamic pressure is more sensitive to changes in scale ratio. As the scale ratio decreases, the aerodynamic pressure on the noise barrier gradually increases.
Originality/value
A train-meeting moving model test is conducted within the noise barrier. Comparison of aerodynamic discrepancies during train meets between two types of rectangular noise barriers and the relationship between the scale and the full scale are established considering the modeling scale ratio.
Keywords
Acknowledgements
This work was funded by the National Natural Science Foundation of China (Grant No. 52308419), the Science and Technology Research and Development Program Project of China railway group limited (Grant Nos. Major Project, 2021-Major-01; Major Project, 2022-Key-22), the Innovation and Technology Commission of the Hong Kong SAR Government (Grant No. K-BBY1), and the Science and Technology Research and Development Program Project of China railway (Grant No. N2022G031).
Credit authorship contribution statement: W.-C.Y.: funding acquisition, conceptualization, writing-review and editing; G.-Z.L.: investigation, software, validation, writing-original draft; ED.: funding acquisition, methodology, data curation, writing-review and editing, supervision; D.-H.O.: writing-review and editing; Z.-P.L.: writing-review and editing.
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Citation
Yang, W.-C., Li, G.-Z., Deng, E., Ouyang, D.-H. and Lu, Z.-P. (2024), "Aerodynamic discrepancies of high-speed trains meeting within two types noise barriers: considering modeling scale ratio", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 34 No. 9, pp. 3393-3415. https://doi.org/10.1108/HFF-02-2024-0153
Publisher
:Emerald Publishing Limited
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