Influence of the shape and size of cavities on pressure waves inside high-speed railway tunnels

Heine, Daniela; Ehrenfried, Klaus; Kühnelt, Helmut; Lachinger, Stefan; Rudolph, Michael; Vorwagner, Alois; Saliger, Florian

doi:10.1016/j.jweia.2019.03.032

Cited by 20 publications

(6 citation statements)

References 6 publications

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“…It is noted that in determining the physics of the aerodynamic process, well-known observations and assumptions are confirmed. For example, the statements presented by the researchers [2,3,10,11,12] were identified, namely:…”

Section: Research Procedures and Discussion Of Resultsmentioning

confidence: 99%

“…Today, the software allows with sufficient accuracy to predict and to reproduce the aerodynamic processes in the conditions of high speed traffic. Existing methods and their combinations are the main apparatus of researchers who set various tasks, which allows for comparative analysis [3,4,5,6,9,12]. However, many studies contain assumptions, inaccuracy and incomplete dependencies between the geometric and mechanical parameters of a tunnel and a high-speed train and the environment, which can lead to insufficient physical similarity of processes.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

et al. 2020

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The study of aerodynamic processes in railway tunnels on highspeed railways in the absence of practical experience in operation should be carried out with a sufficient degree of accuracy only by mathematical modeling. A multi-factor experiment was performed, which resulted in solving the optimization task of determining the tunnel cross-sectional area, taking into account aerodynamic processes. Based on the analysis of the results, the conclusion is made about the applicability of the method to the prognosis of aerodynamic effects on prospective tunnel structures of high-speed railways and optimization of geometric parameters of the tunnels.

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Section: Research Procedures and Discussion Of Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

et al. 2020

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“…Many authors have approached the problem through experiments on reduced scale models performed in a laboratory. 14 As in full-scale testing, the tunnel is fixed, and the train is represented by a moving rigid model. In this case, the Reynolds similitude cannot be achieved, due to the large full-scale’s velocity and dimension.…”

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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“…Certain similar conditions must be met to make the test data comparable and useful in the scale model experiment, which includes the similarity of dynamics, geometry, and motion [31]. The thermal similarity when the train enters the tunnel is temporarily ignored because the energy loss and temperature change are minimal.…”

Section: Determination Of Similarity Criterionmentioning

confidence: 99%

Model Test Research on Pressure Wave in the Subway Tunnel

Fang

Zhou

et al. 2020

Preprint

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The pressure wave is of crucial importance for subway development since it greatly influences the comfort while taking. As the subway lines are rapidly developing in the cities, the pressure wave in different subway tunnel constructures is urgently needed to be studied and receded. In this paper, a subway tunnel pressure wave experimental system was designed, constructed, and tested. The influence of train model head shape, train model speed, shaft number in the tunnel, and bypass number in the tunnel on the pressure wave amplitude were experimented with and analyzed. The results show that the train model head shapes significantly impact the amplitude of the initial compression wave in the tunnel. The blunter train model head generates a greater amplitude of the initial compression wave. When the train passes through a single-track tunnel, the maximum positive pressure amplitude of the pressure wave in the tunnel is at the first compression wave at the tunnel entrance. The maximum negative pressure value in the tunnel is at the superposition of the initial compression wave reflected from the first time and the train's body, which is related to the length of the train's body, tunnel length, train's speed, and sound speed. The shaft set in the tunnel decreases the amplitude of the initial compression wave in the tunnel space behind, but it will increase the pressure wave's amplitude reflected in the tunnel when the train passes through the shaft. After the bypass tunnel is added, the initial compression wave propagation in the tunnel behind the bypass tunnel is receded. Still, it also increases the negative pressure amplitude when the train passes.

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Influence of the shape and size of cavities on pressure waves inside high-speed railway tunnels

Cited by 20 publications

References 6 publications

Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

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

Model Test Research on Pressure Wave in the Subway Tunnel

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