Summary
The wave caused by the entrance of a train in a tunnel propagates along the tunnel and is reflected at the opposite end. But during this reflection process a part of the wave propagates outside the tunnel in form of an impulsive-like wave, which is called micro pressure wave. Such a wave can cause inconvenients to people near the portal or cause a structural response of a structure like rattling of windows. Therefore it is important to know the amplitudes of these waves in the environment field of the portal for project work. The aim of this work was to investigate the reliability of model experiments for the micro pressure wave problem. It was done within the Brite EURam III project TRANSAERO.
Comparisons of results from full scale tests in Terranuova-Tunnel on one hand and of tests with a model of the tunnel and the rig of the Institute for Fluid Mechanis and Heat Transfer of the Technical University Vienna on the other hand show good agreement.
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Abbreviations
- A:
-
cross-section of tunnel
- c 0 :
-
speed of sound of air at rest
- d :
-
internal diameter of tunnel
- L :
-
wavelength of pressure wave
- p :
-
differential amplitude of pressure wave
- R :
-
equivalent tunnel radius
- Δu :
-
speed of piston
- x,y,z :
-
Cartesian coordinates
- *:
-
nondimensional values
References
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Reiterer, M., Ehrendorfer, K., Sockel, H. (2002). Experimental Investigation of the Micro Pressure Wave. In: Schulte-Werning, B., Grégoire, R., Malfatti, A., Matschke, G. (eds) TRANSAERO — A European Initiative on Transient Aerodynamics for Railway System Optimisation. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), vol 79. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45854-8_24
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DOI: https://doi.org/10.1007/978-3-540-45854-8_24
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