The nature of the piston effect in metro tunnels according to numerical analysis
PDF (ქართული) (English)

Ключевые слова

Piston wind
A steady stream
Circulatory flow
Flow overflow into the gap
Train speed

Как цитировать

Lanchava, O., & Nozadze, G. . (2021). The nature of the piston effect in metro tunnels according to numerical analysis: The work was carried out with the grant funding of Shota Rustaveli National Science Foundation. Grant number: 216968. Georgian Scientists, 3(1). https://doi.org/10.52340/gs.02.21.281

Аннотация

In the paper, the flow induced by the piston effect in metro tunnels is evaluated by numerical analysis according to the train speed, tunnel and train geometry, types of induced flows and other variable characteristics. It is shown that the presence of two phases is characteristic of the piston effect caused by the movement of trains in metro tunnels. In the first phase, the piston effect is characterized by non-stationarity, and in the second phase, the process stabilizes. It is necessary to take into account the influence of the mentioned phases in order to determine the speed of the circulation flows correctly. The speed of the circulation flow driven by the effect of the piston experiences substantial variation considering the degree of non-stationarity of the process in the case of the average statistical length of the metro tunnels (1200 m) and the nominal speed of the train 30-50 km/h.

https://doi.org/10.52340/gs.02.21.281
PDF (ქართული) (English)

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Лицензия Creative Commons

Это произведение доступно по лицензии Creative Commons «Attribution-NonCommercial-NoDerivatives» («Атрибуция — Некоммерческое использование — Без производных произведений») 4.0 Всемирная.

Copyright (c) 2021 O. A. Lanchava, G. Nozadze

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