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.
On the compression wave generated when a high-speed train enters a tunnel with a flared portal
Zur Druckwellenbildung bei der Einfahrt eines Hochgeschwindigkeitszuges in einen Tunnel mit schrägem Portal
Journal of Fluids and Structures ; 13 , 4 ; 481-498
1999
18 Seiten, 10 Bilder, 16 Quellen
Article (Journal)
English
The theory of the compression wave generated when a high-speed train enters a tunnel
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