Wave effects in a realistic tunnel induced by the passage of high-speed trains

Liu, Tanghong; Jiang, Zhen; Chen, Xiao dong; Zhang, Jie; Liang, Xifeng

doi:10.1016/j.tust.2019.01.023

Cited by 49 publications

(14 citation statements)

References 20 publications

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“…An actual vehicle test can directly and effectively measure the pressure and aerodynamic parameters of the tunnel wall in a real environment [6][7][8][9]. For example, Liu et al [6] found that as the train speed increased, the maximum peak-to-peak pressure change position moved toward the entrance of the tunnel, which was mainly driven by the change of the negative pressure peak. Furthermore, the length of the train led to a significant difference in the peak pressure of the tunnel wall in the middle of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics When Trains Pass Each Other in High-Speed Railway Shield Tunnel

Luo

Wang

et al. 2022

Applied Sciences

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The characteristics of the aerodynamic effects of high-speed trains passing in a shield tunnel were studied using the three-dimensional, compressible, unsteady Reynolds-averaged Navier-Stokes (RANS) equations for the simulation analysis. Numerical calculations were compared with dynamic model tests to verify the reliability of the numerical simulations. The results showed that the compression wave characteristics of high-speed trains in shield tunnels were consistent with those in molded concrete tunnels. When high-speed trains met in the middle of the shield tunnel, the positive and negative peak attenuation rates of shield tunnels were higher than the positive and negative peak attenuation rates of molded lining tunnels, and the maximum pressure attenuation rate could reach 57.8%. At the same time, the micro-pressure wave of the former was reduced by 10.78%, compared with those of the latter. When meeting cars at different locations, the maximum pressure at the intersection in the center of the tunnel was significantly higher than those at other intersection points in the tunnel. Different intersection positions and different tunnel lining structures had relatively little influence on the aerodynamic drag and lateral force, while train speed had a significant influence.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics When Trains Pass Each Other in High-Speed Railway Shield Tunnel

Luo

Wang

et al. 2022

Applied Sciences

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“…Full-scale experimental tests reproduce the actual train-tunnel interaction 12 and are used for the assessment of rolling stock conformity to normative prescriptions. TSI regulations establish that the trains is to be aerodynamically designed so that, for a given combination of train speed and tunnel cross section (reference case), the characteristic pressure variation of TWS will be under maximum prescribed values.…”

Section: The Proposed Approach In the Current State-of-the-artmentioning

confidence: 99%

Virtual homologation of high-speed trains in railway tunnels: A new iterative numerical approach for train-tunnel pressure signature

Brambilla¹,

Schito

Somaschini

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Large overpressures can be produced when a high-speed train enters and crosses a railway tunnel. Predicting them is important since, in critical conditions, pressure variations may be dangerous for train structures and for passengers’ health and comfort. European regulations impose pressure thresholds which trains must comply with in order to be homologated for travelling through tunnels. Currently, full-scale tests are required to demonstrate respect of these prescriptions. In this work, a procedure for calculating the pressure variations inside the tunnel based on 3 D steady CFD simulations and a 1 D compressible fluid-dynamics model is proposed, to be used both as a design tool and for virtual homologation of new rolling stock. Results of a large experimental campaign performed on the Italian high-speed line are used to set-up the proposed methodology and to validate it. Different train geometries, tunnel crossing speeds and tunnel initial air conditions are considered.

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“…An exhaustive study on the train derailment, damage, and cracking of tunnels at high speeds was done by [3], and he also investigated the effects of derailment. The performance of high-speed trains was investigated by [4], where they concluded that as the train speed increases, the pressure amplitude inside and outside the vehicle increases. He also concluded that the dynamic pressure coefficient increases with an increase in tunnel length.…”

Section: Introductionmentioning

confidence: 99%

Design Intent of Future Tunnels

Asadullah¹,

Khan

Rajendran

et al. 2021

ARFMTS

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The sound barrier for bullet trains remains a challenge due to the piston effect causing compression waves at the entry and exit of the tunnel. The air ahead of the train nose is compressed, and the wave propagates through the tunnel at the speed of sound and exits with the generation of micro pressure waves. It gives rise to a complex wave pattern comprising compression at the train nose & expansion at the train tail leading to the positive pressure around the nose and suction around the tail. This is intended to provide exhaustive input for the proper design of a futuristic tunnel. The cross-sectional shapes of the tunnel, whether square, rectangular, circular, or semi-circular, will experience pressure compression wave generated by high-speed train but will influence the flow pattern and hence the compression wave. This paper presents the pressure load on the walls of long and short tunnels for subsonic compressible and transonic flows. The experimental investigation is carried out only for length parameters to study short and long tunnels. Further, flow visualization is also provided after the formation of the sonic boom. The results of this investigation can be an essential data source for optimum design of high-speed tunnels so as to suppress or break the sound barriers, thus, resulting in a safer high-speed train network.

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Wave effects in a realistic tunnel induced by the passage of high-speed trains

Cited by 49 publications

References 20 publications

Aerodynamic Characteristics When Trains Pass Each Other in High-Speed Railway Shield Tunnel

Aerodynamic Characteristics When Trains Pass Each Other in High-Speed Railway Shield Tunnel

Virtual homologation of high-speed trains in railway tunnels: A new iterative numerical approach for train-tunnel pressure signature

Design Intent of Future Tunnels

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