Pressure gradients during train entry - practical design data

A. E. Vardy, J. M. B. Brown

    Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

    Abstract

    Predictions of rates of change of pressure caused by trains entering tunnels with simple portals are presented in sufficient detail for use to be made of them in practical tunnel design. The analytical method is not new; it is the work of MS Howe and collaborators. However, the results are presented in a form that is more accessible to most engineers than the mathematical expressions used by Howe to present extensive work in a concise form. It is shown that the maximum rate of change of pressure for trains with short noses is almost independent of the nose length (provided that they are suitably rounded), but that rates of change reduce with increasing nose length. Detailed data are presented in graphical and tabular form for three generic nose shapes and a practical method of using the data for non-generic shapes is proposed. The overall purpose of the paper is to provide a simple means of avoiding the need for resource-intensive calculations in design studies where it is not obvious a priori whether special precautions will be needed at tunnel entrances to prevent the radiation of unacceptable MPWs from tunnel outlets.
    Original languageEnglish
    Title of host publicationBHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels
    EditorsK. Hunt
    PublisherBHR Group
    Pages237-255
    Number of pages19
    ISBN (Print)978-185598123-2
    Publication statusPublished - 2011
    Event14th International Symposium on Aerodynamics and Ventilation of Tunnels - Dundee, United Kingdom
    Duration: 11 May 201113 May 2011
    http://www.gbv.de/dms/tib-ub-hannover/665621566.pdf

    Conference

    Conference14th International Symposium on Aerodynamics and Ventilation of Tunnels
    CountryUnited Kingdom
    CityDundee
    Period11/05/1113/05/11
    Internet address

    Fingerprint

    Pressure gradient
    Tunnels
    Radiation
    Engineers

    Cite this

    Vardy, A. E., & Brown, J. M. B. (2011). Pressure gradients during train entry - practical design data. In K. Hunt (Ed.), BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels (pp. 237-255). BHR Group.
    Vardy, A. E. ; Brown, J. M. B. / Pressure gradients during train entry - practical design data. BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels. editor / K. Hunt. BHR Group, 2011. pp. 237-255
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    Vardy, AE & Brown, JMB 2011, Pressure gradients during train entry - practical design data. in K Hunt (ed.), BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels. BHR Group, pp. 237-255, 14th International Symposium on Aerodynamics and Ventilation of Tunnels, Dundee, United Kingdom, 11/05/11.

    Pressure gradients during train entry - practical design data. / Vardy, A. E.; Brown, J. M. B.

    BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels. ed. / K. Hunt. BHR Group, 2011. p. 237-255.

    Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

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    AU - Brown, J. M. B.

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    AB - Predictions of rates of change of pressure caused by trains entering tunnels with simple portals are presented in sufficient detail for use to be made of them in practical tunnel design. The analytical method is not new; it is the work of MS Howe and collaborators. However, the results are presented in a form that is more accessible to most engineers than the mathematical expressions used by Howe to present extensive work in a concise form. It is shown that the maximum rate of change of pressure for trains with short noses is almost independent of the nose length (provided that they are suitably rounded), but that rates of change reduce with increasing nose length. Detailed data are presented in graphical and tabular form for three generic nose shapes and a practical method of using the data for non-generic shapes is proposed. The overall purpose of the paper is to provide a simple means of avoiding the need for resource-intensive calculations in design studies where it is not obvious a priori whether special precautions will be needed at tunnel entrances to prevent the radiation of unacceptable MPWs from tunnel outlets.

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    M3 - Other chapter contribution

    SN - 978-185598123-2

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    Vardy AE, Brown JMB. Pressure gradients during train entry - practical design data. In Hunt K, editor, BHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels. BHR Group. 2011. p. 237-255