The design of new high-speed railway lines requires longer and more numerous tunnel sections, where aerodynamic effects limit the maximum allowable train velocity for a given tunnel cross-section area. These effects influence the train power requirement, the traction energy costs and the pressure wave aplitude: the knowledge of the unteady aerodynamic field around the train is therefore essential to the optimum choice of a tunnel configuration, and mainly of the cross-section diameter and of the presence and position of pressure relief ducts. In this paper, the aerodynamic phenomena generated by a trai travelling at high speed through a long tunnel of small cross section are analyzed by means of quasi one-dimensional numerical simulation of the air flow induced by a train travellin at 120 m/s in a tunnel connecting two stations 60 km apart.

The alleviation of the aerodynamic drag and wave effects of high speed trains in very long tunnels

SIBILLA, STEFANO
2001-01-01

Abstract

The design of new high-speed railway lines requires longer and more numerous tunnel sections, where aerodynamic effects limit the maximum allowable train velocity for a given tunnel cross-section area. These effects influence the train power requirement, the traction energy costs and the pressure wave aplitude: the knowledge of the unteady aerodynamic field around the train is therefore essential to the optimum choice of a tunnel configuration, and mainly of the cross-section diameter and of the presence and position of pressure relief ducts. In this paper, the aerodynamic phenomena generated by a trai travelling at high speed through a long tunnel of small cross section are analyzed by means of quasi one-dimensional numerical simulation of the air flow induced by a train travellin at 120 m/s in a tunnel connecting two stations 60 km apart.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/117804
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