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Pressure gradients during train entry - practical design data

Pressure gradients during train entry - practical design data

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Original languageEnglish
TitleBHR Group - 14th International Symposium on Aerodynamics and Ventilation of Tunnels
EditorsK. Hunt
PublisherBHR Group
Publication date2011
Pages237-255
Number of pages19
ISBN (Print)978-185598123-2
StatePublished

Conference

Conference14th International Symposium on Aerodynamics and Ventilation of Tunnels
CountryUnited Kingdom
CityDundee
Period11/05/1113/05/11
Internet addresshttp://www.gbv.de/dms/tib-ub-hannover/665621566.pdf

Abstract

Predictions of rates of change of pressure caused by trains entering tunnels with simple portals are presented in sufficient detail for use to be made of them in practical tunnel design. The analytical method is not new; it is the work of MS Howe and collaborators. However, the results are presented in a form that is more accessible to most engineers than the mathematical expressions used by Howe to present extensive work in a concise form. It is shown that the maximum rate of change of pressure for trains with short noses is almost independent of the nose length (provided that they are suitably rounded), but that rates of change reduce with increasing nose length. Detailed data are presented in graphical and tabular form for three generic nose shapes and a practical method of using the data for non-generic shapes is proposed. The overall purpose of the paper is to provide a simple means of avoiding the need for resource-intensive calculations in design studies where it is not obvious a priori whether special precautions will be needed at tunnel entrances to prevent the radiation of unacceptable MPWs from tunnel outlets. © BHR Group 2011.

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