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PRESSURE VARIATIONS, AERODYNAMIC DRAG OF TRAIN, AND NATURAL VENTILATION IN SHIN KANSEN TYPE TUNNEL

Ayano Yamamoto

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Abstract

The aerodynamic problems of high-speed trains and tunnel ventilation have been investigated using a one dimensional unsteady flow model. Pressure variations in a tunnel must involve the compressibility of air, the friction between the side of the train and the tunnel wall, particularly when trains are 300 to 400 m long. In a double-tracked tunnel the passing of two trains must also be studied. In this case, the superposition of characteristic waves serves suitably. In long underwater tunnels, the problems of ventilating heat and gases must be considered since piston effects are insufficient to ventilate double-track tunnels. Results are given for the double-track Shin Kansen tunnel at speeds up to 500 kph.

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What this paper is about

The aerodynamic problems of high-speed trains and tunnel ventilation have been investigated using a one dimensional unsteady flow model. Pressure variations in a tunnel must involve the compressibility of air, the friction between the side of the train and the tunnel wall, particularly when trains are 300 to 400 m long. In a double-tracked tunnel the passing of two trains must also be studied. In this case, the superposition of characteristic waves serves suitably. In long underwater tunnels, the problems of ventilating heat and gases must be considered since piston effects are insufficient to ventilate double-track tunnels. Results are given for the double-track Shin Kansen tunnel at speeds up to 500 kph.

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Available abstract

The aerodynamic problems of high-speed trains and tunnel ventilation have been investigated using a one dimensional unsteady flow model. Pressure variations in a tunnel must involve the compressibility of air, the friction between the side of the train and the tunnel wall, particularly when trains are 300 to 400 m long. In a double-tracked tunnel the passing of two trains must also be studied. In this case, the superposition of characteristic waves serves suitably. In long underwater tunnels, the problems of ventilating heat and gases must be considered since piston effects are insufficient to ventilate double-track tunnels. Results are given for the double-track Shin Kansen tunnel at speeds up to 500 kph.

Key concepts: Train, Aerodynamic drag, Aerodynamics, Drag, Track (disk drive), Engineering, Ventilation (architecture), Railway tunnel

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PRESSURE VARIATIONS, AERODYNAMIC DRAG OF TRAIN, AND NATURAL VENTILATION IN SHIN KANSEN TYPE TUNNEL — Research Paper | ScholarLens