A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The reduction of pressure transients in railway tunnels
Various methods of modifying railway trains and/or tunnels in order to reduce the effects of pressure fluctuations in the tunnels are discussed both qualitatively and quantitatively. Each proposed modification is assessed from the point of view of passenger comfort, and it is shown that short term solutions are most likely to come from changes to tunnel rather than train design. Long, flared or ventilated entrance regions are shown to be effective for single trains in tunnels, but less effective for the more critical case of two trains passing in a tunnel. Airshafts are useful for both cases, but their optimum size surprisingly increases with the number of shafts used. Experimental evidence is presented to justify basing the analysis on a numerical solution of the equations of motion governing the unsteady flow of a compressible fluid in uni-dimensional ducts.
The reduction of pressure transients in railway tunnels
Various methods of modifying railway trains and/or tunnels in order to reduce the effects of pressure fluctuations in the tunnels are discussed both qualitatively and quantitatively. Each proposed modification is assessed from the point of view of passenger comfort, and it is shown that short term solutions are most likely to come from changes to tunnel rather than train design. Long, flared or ventilated entrance regions are shown to be effective for single trains in tunnels, but less effective for the more critical case of two trains passing in a tunnel. Airshafts are useful for both cases, but their optimum size surprisingly increases with the number of shafts used. Experimental evidence is presented to justify basing the analysis on a numerical solution of the equations of motion governing the unsteady flow of a compressible fluid in uni-dimensional ducts.
The reduction of pressure transients in railway tunnels
Verminderung der Druckschwankungen in Eisenbahntunnels
Vardy, A.E. (author)
1976
6 Seiten, 6 Bilder, 6 Quellen
Conference paper
English
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