Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improve train tunnels. A dynamical ventilation model
Trains move air through tunnels at rates of 600 m3/s which is much more than flow rates in buildings. Air pressures can vary to some 3000 Pa leading to air velocities in the range of 10 to 50 m/s. This can lead to unsafe situations and thermal discomfort. The development of high speed trains causes more concern for better tunnel design. Modern stations often house small shops and restaurants, that require lower air velocities for thermal comfort. A dynamical ventilation model has been made to study effects of improvements. An array of controlled fans seems to be a very effective draught remover. The dynamical model is programmed to serve as a demo to give insight in the matter and can be shown in just a couple of minutes from a PC. (A copy can be requested via e-mail to J.Pfaff(at)bouw.tno.nl Subject: TRAIN DEMO, still valid in April 1997) The model is basically a dynamical bernoulli equation and the normal technical transport equations through ducts with side branches and air flow around bodies, mainly by correct use of hydraulical diameters. The tunnel is subdivided in sections. Every section may have a ventilation duct to outside. The train is modelled with its friction loss at the front, side and rear. A special concern is the air velocity along the train. The network of tunnel segments and side branches is numerically solved but the pressure losses per section are mostly analytical solutions.
Improve train tunnels. A dynamical ventilation model
Trains move air through tunnels at rates of 600 m3/s which is much more than flow rates in buildings. Air pressures can vary to some 3000 Pa leading to air velocities in the range of 10 to 50 m/s. This can lead to unsafe situations and thermal discomfort. The development of high speed trains causes more concern for better tunnel design. Modern stations often house small shops and restaurants, that require lower air velocities for thermal comfort. A dynamical ventilation model has been made to study effects of improvements. An array of controlled fans seems to be a very effective draught remover. The dynamical model is programmed to serve as a demo to give insight in the matter and can be shown in just a couple of minutes from a PC. (A copy can be requested via e-mail to J.Pfaff(at)bouw.tno.nl Subject: TRAIN DEMO, still valid in April 1997) The model is basically a dynamical bernoulli equation and the normal technical transport equations through ducts with side branches and air flow around bodies, mainly by correct use of hydraulical diameters. The tunnel is subdivided in sections. Every section may have a ventilation duct to outside. The train is modelled with its friction loss at the front, side and rear. A special concern is the air velocity along the train. The network of tunnel segments and side branches is numerically solved but the pressure losses per section are mostly analytical solutions.
Improve train tunnels. A dynamical ventilation model
Untergrundbahn-Tunnelbau. Ein dynamisches Ventilationsmodell
Phaff, H.J.C. (Autor:in) / Gids, W.F. de (Autor:in)
1996
5 Seiten, 6 Bilder
Aufsatz (Konferenz)
Englisch
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