Compressible and Leaky Trains in Tunnels-Reference-Cited by-同舟云学术

Compressible and Leaky Trains in Tunnels

Published:1987-07 Issue:3 Volume:201 Page:209-215
ISSN:0265-1904
Container-title:Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering
language:en
Short-container-title:Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering

Author:

Vardy A E¹,Fox J A²

Affiliation:

1. Department of Civil Engineering, University of Dundee

2. Department of Civil Engineering, University of Leeds

Abstract

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.

Publisher

SAGE Publications

Subject

General Engineering,General Medicine

Link

http://journals.sagepub.com/doi/pdf/10.1243/PIME_PROC_1987_201_178_02

Reference8 articles.

1. Gawthorpe R. G., Pope C. W. The measurement and interpretation of transient pressures generated by trains in tunnels. Proceedings of Second International Symposium on The aerodynamics and ventilation of vehicle tunnels, Cambridge, UK, 1976, paper C3–35:54 (BHRA, Cranfield).

2. Effects of Humidity on the Velocity of Sound in Air

3. Harwarth F., Sockel H. Unsteady flow due to trains passing a tunnel. Proceedings of Third International Symposium on The Aerodynamics and ventilation of vehicle tunnels, Sheffield, UK, 1979, pp. 151–160 (BHRA, Cranfield).

4. Vardy A. E. Unsteady flows: fact and friction. Proceedings of Third International Conference on Pressure surges, Canterbury, UK, 1980, pp. 15–26 (BHRA, Cranfield).

5. Vardy A. E., Dayman B. Alleviation of tunnel entry pressure transients: 2. theoretical modelling and experimental correlation. Proceedings of Third International Symposium on The aerodynamics and ventilation of vehicle tunnels, Sheffield, UK, 1979, pp. 363–276 (BHRA, Cranfield).

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