Field measurements of aerodynamic pressures in tunnels induced by high speed trains

Ko, Yung‐Yen; Chen, Cheng Hsing; Hoe, Ing Tsang; Wang, Shin Tsyr

doi:10.1016/j.jweia.2011.10.008

Cited by 80 publications

(32 citation statements)

References 7 publications

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“…Baron et al [18] studied the effect of pressure relief devices on the pressure 65 waves generated by high speed trains. Ko et al [19] studied induced pressures in tunnels through field measurements and found that the cross sectional area of the tunnel is a major influence on the magnitude of induced pressures. It was also found that pressure peaks were proportional to train speed.…”

mentioning

confidence: 99%

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Cross

Hughes

Ingham

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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In order to ensure the safety and comfort of passengers and staff, an underground railway requires an extensive ventilation and cooling system. One mechanism for underground railway ventilation is the movement of air induced by trains, termed the 'piston effect'. This study investigated the effect of altering the blockage ratio of an underground train upon the ventilating air flows driven by a train. First a computational model was developed and validated with experimental data from literature. This model was scaled to represent an operational underground railway with high blockage ratio and the blockage ratio varied to evaluate the effects upon ventilation. The results of this study show that ventilating air flows can be increased significantly during periods of constant train motion and acceleration, by factors of 1.4 and 2 respectively, but that the train drag will increase at the same rate. During deceleration negligible increases in ventilation flows are found but drag increases by a factor of 4.

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mentioning

confidence: 99%

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Cross

Hughes

Ingham

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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show abstract

“…The pressure variation becomes more significant further inside the tunnel such as x=400m and x=500 m due to the nose-entry compression which fully has been developed. Generally, the pressure variations in the tunnel are very complex due to the superposition of reflected waves and passing-by of the trains, the positive maximum pressure measured on the tunnel wall is induced by the nose-entry compression wave while the negative maximum pressure is not only affected by the expansion wave but also influenced by the passing-by of the trains (Ko et al 2012). When the train passes through a certain location inside the tunnel, the surrounding air will be driven to move accordingly, the pressure waveforms of x=400 m and x=500 m in Fig.10 have a sudden drop at t=6.5 and t=7.9 s respectively due to the nose passing-by of train A.…”

Section: Model Validationmentioning

confidence: 99%

Aerodynamic Study of Two Opposing Moving Trains in a Tunnel Based on Different Nose Contours

Liu

Zhang

et al. 2017

JAFM

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It is well known that the train nose shape has significant influence on the aerodynamic characteristics. This study explores the influence of four kinds of nose shapes (fusiform, flat-broad, bulge-broad, ellipsoidal) on the aerodynamic performance of two opposing high-speed trains passing by each other through a tunnel at 250 km/h. The method of three dimensional, compressible, unsteady Reynolds-averaged Navier-Stokes equations and RNG k-ε double equation turbulence model was carried out to simulate the whole process of two trains passing by each other inside a tunnel. Then the pressure variations on tunnel wall and train surface are compared with previous full-scale test to validate the numerical method adopted in this paper. The assessment characteristics, such as transient pressure and aerodynamic loading, are analyzed to investigate the influence of nose shape on these assessment parameters. It is revealed that aerodynamic performance of trains which have longitudinal nose profile line B (fusiform, flat-broad shape) is relatively better when passing by each other in a tunnel. The results can be used as a guideline for high-speed train nose shape design.

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“…The increasing operation speed of high speed trains has given rise to a series of aerodynamic problems, and the aerodynamic effects of a train passing through a tunnel lead to passenger discomfort, noise, additional aerodynamic resistance , and possible damage to the train body and tunnel facilities [1][2][3] . Existing studies on tunnel aerodynamics can be divided into three categories: in situ tests [4,5] , moving model rig (MMR) experiments [6,7] and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Self-Adaptive Euler Equation Solver with Moving Boundary Conditions to Simulate Tunnel Aerodynamics

Xu¹,

Chen²,

Liu³

2017

dtetr

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A self-adaptive Euler equation solver with moving boundary conditions was developed to simulate the aerodynamic effects induced by a high speed train passing through a tunnel. First, a mesh generation method was developed based on the omni-tree grid structure, and a hybrid mesh generation strategy was established based on a structured grid and a Cartesian grid. Then, a three-dimensional numerical solver was constructed based on the Euler equations, and moving boundary conditions were developed in the numerical solver. Taking the absolute value of the pressure gradient as the control parameter, the grid size can be automatically adjusted under the moving boundary condition. The developed numerical solver was used to simulate a train passing through a tunnel, and the pressure time histories at the probes on the tunnel wall were analysed. In addition, moving model rig experiments were performed under the same conditions, and the numerical results and experimental results were compared. The results agreed well, indicating that both the mesh generation strategy and the numerical solver are highly accurate and could be a good choice for simulating tunnel aerodynamic problems in moving boundary conditions.

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Field measurements of aerodynamic pressures in tunnels induced by high speed trains

Cited by 80 publications

References 7 publications

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Aerodynamic Study of Two Opposing Moving Trains in a Tunnel Based on Different Nose Contours

Self-Adaptive Euler Equation Solver with Moving Boundary Conditions to Simulate Tunnel Aerodynamics

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