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| Seuring, Stefan |
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| Nor Azizi, S. |
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| Pato, Margarida Vaz |
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| Kölker, Katrin |
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| Huber, Oliver |
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| Király, Tamás |
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| Spengler, Thomas Stefan |
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| Al-Ammar, Essam A. |
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| Dargahi, Fatemeh |
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| Mota, Rui |
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| Mazalan, Nurul Aliah Amirah |
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| Macharis, Cathy | Brussels |
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| Arunasari, Yova Tri |
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| Nunez, Alfredo | Delft |
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| Bouhorma, Mohammed |
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| Bonato, Matteo |
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| Fitriani, Ira |
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| Autor Correspondente Coelho, Sílvia. |
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| Pond, Stephen |
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| Okwara, Ukoha Kalu |
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| Toufigh, Vahid |
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| Campisi, Tiziana | Enna |
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| Ermolieva, Tatiana |
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| Sánchez-Cambronero, Santos |
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| Agzamov, Akhror |
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Soper, David
University of Birmingham
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2022The Flow Around a Lorry Platoon Subject to a Crosswind—a Detached Eddy Simulationcitations
- 2022Development of a novel railway positioning system using RFID technologycitations
- 2021Investigation of the aerodynamic phenomena associated with a long lorry platoon running through a tunnelcitations
- 2019Numerical simulations of the separated flow around a freight train passing through a tunnel using the sliding mesh techniquecitations
- 2019Experimental investigation of the aerodynamics of a freight train passing through a tunnel using a moving modelcitations
- 2019Detached eddy simulation of a closely running lorry platooncitations
- 2018A comparison of methods to simulate the aerodynamic flow beneath a high speed traincitations
- 2018The calculation of the overturning wind speed of large road vehicles at exposed sitescitations
- 2016The influence of ballast shoulder height on train aerodynamic flow development
- 2015An experimental investigation to assess the influence of container loading configuration on the effects of a crosswind on a container freight traincitations
- 2015The behaviour of long entrance hoods for high speed rail tunnels
- 2014Detached-eddy simulation of the slipstream of an operational freight traincitations
- 2013The Slipstream development of a container freight train
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document
The behaviour of long entrance hoods for high speed rail tunnels
Abstract
<p>Micro-pressure waves (MPWs, sometimes known as sonic booms) must be mitigated in the design of high speed rail tunnels, typically by the use of perforated tunnel entrance "hoods". These reduce the gradients of the pressure waves caused by train entry and thereby reduce the amplitudes of the MPWs emitted from tunnel exits. The required length of an entrance hood depends strongly on the train speed because the pressure gradient at the tunnel entrance varies with the cube of the train speed. Typical entrance hoods on existing tunnels for speeds of 250-300 km/h are up to 50 m long As the design speeds for new railways increase to 350 km/h or more, the hoods must become significantly longer. This paper presents an investigation into suitable designs for 100 m long perforated entrance hoods. It is shown that a simple configuration with a tapered cross sectional area and uniformly distributed openings gives close to the best that is practicably possible. This configuration differs markedly from that used for typical hoods on existing tunnels. The presentation begins with a theoretical assessment that enables the overall behaviour to be described and understood. This is followed by comparisons with detailed measurements in a 4% scale model. A valuable spin-off benefit is a provisional conclusion that the performance of such hoods can be predicted with reasonable accuracy using simple ID methods that are already used widely for other purposes of tunnel design.</p>
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