It is hypothesized that phase differences commonly observed between computed and measured pressure histories in railway tunnels may be caused in part by reduced acoustic wave speeds in the annular regions of flow alongside trains. Such reductions in wave speed are shown to be a possible consequence of the compressibility of trains and/or the leakage of air into and out of trains. These effects are shown to be capable in principle of reducing the effective wave speed by a factor of (1-β)1/2 where β denotes the train-tunnel area blockage ratio.

    The potential influence of reduced wave speeds due to these causes is shown to be much greater in short tunnels than in long tunnels. An alternative explanation for the discrepancies observed in long tunnels has yet to be found.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Compressible and Leaky Trains in Tunnels


    Contributors:
    Vardy, A E (author) / Fox, J A (author)


    Publication date :

    1987-07-01


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Aerodynamic drag of trains in tunnels

    Hara, T. | Engineering Index Backfile | 1967


    Communication with moving trains in tunnels

    Monk, N. / Winbigler, H.S. | Engineering Index Backfile | 1956


    Aerodynamic Effects Caused by Trains Entering Tunnels

    Liu, T.-h. / Tian, H.-q. / Liang, X.-f. | British Library Online Contents | 2010


    The Aerodynamics of High Speed Trains in Tunnels

    Henson, D. A. / MacDonald, M. / American Public Transit Association | British Library Conference Proceedings | 1993