Wind Tunnel Study on Aerodynamic Characteristics of the Train on Viaducts with a New Type of Wind–Noise Barrier Under Cross Wind

Jiang, Shuo; Zou, Yunfeng; He, Xuhui; Cai, Chenzhi; Zhai, Leilei; Nong, Xingzhong

doi:10.1142/s0219455422410048

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…Domestic and abroad researchers, in the past, analyzed and evaluated the stability and safety of trains under crosswind environments based on the theory of vehicle dynamics, while the adopted methods can be divided into the full-scale test, bench test and numerical simulation. Since the 1960s, Japan (Ikemori, 1978), China (Bian et al , 2014) and other countries have measured the stability of trains based on the full-scale test and bench test, which provides an essential reference to the relevant research through this experiments (Jiang et al , 2022; Zou et al , 2022). Nevertheless, the full-scale test also shows its limitations in practice, such as the long test period, low repeatability and difficulty obtaining test results under extreme conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Zeng

Huang

et al. 2023

HFF

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Purpose Based on the aerodynamic loads and dynamic performances of trains, this study aims to investigate the effect of crosswinds and raindrops on intercity trains operating on viaducts to ensure the safe operation of intercity railways in metropolitan areas. Design/methodology/approach An approach coupled with the Euler multiphase model as well as the standard k-ɛ turbulence model is used to investigate the coupled flow feature surrounding trains and viaducts, including airflow and raindrops, and the numerical results are validated with those of the wind tunnel test. Additionally, the train’s dynamic response and the operating safety region in different crosswind speeds and rainfall is investigated based on train’s aerodynamic loads and the train wheel–rail dynamics simulation. Findings The aerodynamic loads of trains at varying running speeds exhibit an increasing trend as the increase of wind speed and rainfall intensity. The motion of raindrop particles demonstrates a significant similarity with the airflow in wind and rain environments, as a result of the dominance of airflow and the supplementary impacts of droplets. As the train’s operating speed ranged between 120 and 200 km/h and within a rainfall range of 20–100 mm/h, the safe operating region of trains decreased by 0.56%–7.03%, compared with the no-rain condition (0 mm/h). Originality/value The impact of crosswind speeds and rainfall on the train’s aerodynamic safety is studied, including the flow feature of crosswind and different particle-sized raindrops around the train and viaduct, aerodynamic loads coefficients suffered by the intercity train as well as the operating safety region of intercity trains on the viaduct.

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Section: Introductionmentioning

confidence: 99%

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Zeng

Huang

et al. 2023

HFF

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“…The wind barrier can not only be used to prevent the wind to ensure the stability of the train, but also can be combined with the sound barrier to play a variety of roles such as noise reduction and pressure relief. Jiang et al (2022) proposed a new type of wind-noise barrier (NT-WNB) to meet the wind resistance and noise reduction requirements of the elevated lines crossing an urban area at the same time with numerical and wind tunnel tests. However, the influence of the wind barriers on the aerodynamic characteristics of large-span bridges in parallel should also be considered for the aerodynamic interference effect.…”

Section: Introductionmentioning

confidence: 99%

Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Liu,

Yang,

Zou

et al. 2023

Advances in Structural Engineering

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The aerodynamic characteristics of twin-separated parallel decks for long-span rail-cum-road bridges with various wind barriers clamped at railway girder are more complicated because of aerodynamic interference. Experimental investigations on aerodynamic coefficient and wind pressure coefficients of twin girders under different incoming flow directions were conducted using wind tunnel tests. Three different heights ( H) varying from 2 m to 4 m and four different ventilation ratios ( R) varying from 20% to 50% for wind barriers were examined. Results indicated that the aerodynamic coefficients were affected significantly by the incoming wind direction, which must be considered, and the railway wind barrier affected the aerodynamic characteristics of the railway girder when it is located both upstream and downstream, but the laws are not the same. Due to the aerodynamic interference effect of the twin parallel girders, the aerodynamic characteristics of the adjacent highway girders were also affected by the wind barrier along the railway girder, especially when the highway girders were located downstream. While, the highway girders were less affected when located upstream. The influence of wind barrier height and ventilation ratios on the adjacent highway girders was completely different. Most importantly, the parameters optimization of wind barriers clamped at railway girders should be determined after a comprehensive evaluation of the aerodynamic characteristic of both the railway and highway girders.

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Dynamic Interaction Analysis and Running Safety Assessment of the Wind–Train–Bridge System Considering the Moving Train’s Aerodynamic Coupling with Crosswind

Yao

Zhang

Zhu

et al. 2023

Int. J. Str. Stab. Dyn.

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Trains tend to be faster and lighter to meet the increasing public travel needs and interact with crosswind to produce a strong aerodynamic interaction, leaving a safety hazard for the operation. This paper presents a study into the dynamic response and running safety of the train–bridge system accounting for this aerodynamic interaction. The three-dimensional flow features of a moving train in crosswinds are first investigated by a computational fluid dynamics method, and then an aerodynamic model for simulating unsteady crosswind force is developed. Furthermore, the dynamic responses of the train and bridge are calculated by using a wind–train–bridge dynamic interaction equation, and finally, the characteristic wind curve and surface are defined to evaluate the train’s running safety. The results show that the lateral response of the train–bridge system significantly increases as the crosswind increases, and the head car can experience a high derailment risk and determine the running safety of the train due to the aerodynamic coupling effect of a moving train and crosswind. Variations in the wind direction need to be factored into the safety assessment for low train speeds, and the train is at greater danger when the crosswind appears perpendicular to the car body.

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Wind Tunnel Study on Aerodynamic Characteristics of the Train on Viaducts with a New Type of Wind–Noise Barrier Under Cross Wind

Cited by 5 publications

References 30 publications

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Influence of wind and rain environment on operational safety of intercity train running on the viaduct

Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Dynamic Interaction Analysis and Running Safety Assessment of the Wind–Train–Bridge System Considering the Moving Train’s Aerodynamic Coupling with Crosswind

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