Numerical Study of Compression Waves Produced by High-Speed Trains Entering a Tunnel : Effects of Shape of Hood
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In this article, the effects of the shape of the hood on the shape and the strength of compression waves were quantitatively clarified in tunnels with various hoods of different shapes in cases in which the speed of the train was 200 or 300 km/h.Abstract:
In this study, compression waves produced by trains which enter a hooded tunnel at high speed were numerically investigated. Equations of the one-dimensional, unsteady and compressible flow in which the area of a tube is dependent on the time and the distance were numerically solved by the method of characteristics. The calculations were performed for tunnels with various hoods of different shapes in cases in which the speed of the train was 200 km/h or 300 km/h, and the effects of the shape of the hood on the shape and the strength of compression waves were quantitatively clarified. The results show that the pressure gradient of compression waves is greatly affected by the shape of the hood.read more
Citations
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References
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Journal Article
Reduction of micro-pressure wave radiated from tunnel exit by hood at tunnel entrance
TL;DR: In this paper, a standardized hood, developed by model tests, is to be installed on existing and extended lines of the Shinkansen to reduce the micro-pressure wave preceding trains.
Journal ArticleDOI
Wave reflections from slotted tunnel portals
TL;DR: In this paper, a linearized analysis of a pressure impulse and a pressure step reflecting off a portal consisting of a long slotted section is presented, showing that the infinitely steep rise of the incident wave is reflected as a pressure rise of finite slope, and the pressure amplitude may exceed that of the input for some points in time.
Journal ArticleDOI
Numerical Study on Nonlinear Effects of Compression Waves Propagated in a Tube.
Kazuyuki Kage,Shigetoshi Kawagoe +1 more
TL;DR: In this paper, the nonlinear effects of compression waves propagated in a tube were numerically investigated, and the equations of the one-dimensional, unsteady compressible flow with the skin friction of the wall in which the area of a tube varies with time are numerically solved by the method of characteristics.
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