In this paper, the theory of compression wave generation is discussed for a train entering a tunnel with a flared entrance. The initial compression wave profile is determined in terms of a Green's function tailored to the tunnel entrance geometry, and a distribution of monopole sources that represent the displacement of fluid by the advancing train. This can be done analytically for arbitrary portal geometry for train Mach numbers satisfying M2 << 1 by the method of Howe (1998a). It is shown how these results can be extrapolated to encompass the higher Mach numbers (0.4) encountered in modern high-speed operations. The extrapolation formula is justified by comparison with exact analytical predictions and with experiment for the special case of a 'tunnel' formed by an unflanged circular cylinder.


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    Title :

    On the compression wave generated when a high-speed train enters a tunnel with a flared portal


    Additional title:

    Zur Druckwellenbildung bei der Einfahrt eines Hochgeschwindigkeitszuges in einen Tunnel mit schrägem Portal


    Contributors:
    Howe, M.S. (author)

    Published in:

    Publication date :

    1999


    Size :

    18 Seiten, 10 Bilder, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English