Numerical Study on Aerodynamic Characteristics of Train-bridge System Subjected to Tornado

被引：0

作者：

Lang T. ^{[1
]}

Wang H. ^{[1
]}

Zhang H. ^{[1
]}

Wang F. ^{[2
]}

机构：

[1] Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education, Southeast University, Nanjing

[2] Department of Science, Technology and Information Technology, China State Railway Group Co., Ltd., Beijing

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 02期

关键词：

aerodynamic characteristics; numerical simulation; tornado; train; train-bridge system;

D O I：

10.3969/j.issn.1001-8360.2023.02.016

中图分类号：

学科分类号：

摘要：

As one of the extreme wind disasters, tornadoes cause serious damage to infrastructure, resulting apotential threat to the operation of high-speed railway located in tornado-prone areas. In this paper, the aerodynamic characteristics of high-speed train-bridge system under the action of tornado were investigated based on computational fluid dynamics technology. Firstly, the numerical model of a typical tornado simulator was established to simulate the tornado flow field. Secondly, the simplified CRH2 high-speed train model and a segment model of a typical railway bridge were established to analyze the aerodynamic characteristics of the train-bridge system in crosswind numerically to compare with the wind tunnel test to validate the two models. Finally, the train-bridge model was embedded into the numerical wind field of tornado to analyze the aerodynamic characteristics of the train-bridge system and to study the variation of side force and heeling moment of the train passing through the tornado. The results show that the aerodynamic performance of the train-bridge system under tornado presents obvious three-dimensional characteristics and the streamline and wind pressure distribution of tornado vortex flow are significantly affected by the train-bridge system. A negative pressure field is formed inside the tornado. Under the influence of the train-bridge system, the negative pressure area expands, and the pressure contour is convex along the shape of the train-bridge system. The pressure on the windward side of the train increases along the radial direction with a minimum negative pressure at the windward side and the top corner. The maximum side force and the heeling moment of the train occur near the vortex core. The most unfavorable position of the side force on the train is the windward side, and the most unfavorable position of the heeling moment on the train is the leeward side. © 2023 Science Press. All rights reserved.

引用

页码：146 / 153

页数：7

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