ON THE EVALUATION OF AIR FLOWS CAUSED BY A PISTON EFFECT IN SUBWAY TUNNELS

Omar  Lanchava; Giorgi  Nozadze; Zaza Khokerashvili; Nino Arudashvili

doi:10.52340/gs.02.21.279

Vol. 3 No. 1 (2021), Mining Engineering

Vol. 3 No. 1 (2021)

ON THE EVALUATION OF AIR FLOWS CAUSED BY A PISTON EFFECT IN SUBWAY TUNNELS

Mining Engineering

https://doi.org/10.52340/gs.02.21.279

Published 2021-06-10

Omar Lanchava⁺⁻
Giorgi Nozadze⁺⁻
Zaza Khokerashvili⁺⁻
Nino Arudashvili⁺⁻

Omar Lanchava

https://orcid.org/0000-0003-4249-9404

Giorgi Nozadze

Zaza Khokerashvili

Georgian Technical University

Nino Arudashvili

Georgian Technical University

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How to Cite

Lanchava, O., Nozadze, G. ., Khokerashvili, Z., & Arudashvili, N. (2021). ON THE EVALUATION OF AIR FLOWS CAUSED BY A PISTON EFFECT IN SUBWAY TUNNELS. Georgian Scientists, 3(1). https://doi.org/10.52340/gs.02.21.279

Abstract

The results of numerical simulation of the piston effect in tunnels of a metro in combination with theoretical analysis are given. In the form of tables and graphs given the changes in these values depending on the speed of the train and the filling factor of the tunnel. The obtained results are compared with known analogous results from the literature sources. As a result of the comparison, there is a good agreement between of the main results presented in this paper and mentioned results. In this work established that the piston effect of the moving train in the subway tunnels is characterized by the existence of two phases that should be taken into consideration during estimation of the speed of air (circulation flows) ahead and rear of the train and the backflow in the annulus between a tunnel and moving train. In the first phase the piston effect has a non-stationary character and the process is stabilized in the second phase.

https://doi.org/10.52340/gs.02.21.279

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References

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S. Pan, L. Fan, J.Liu, J. Xie, Y.Sun, N. Cui, L. Zhang, B. Zheng. A Review of the Piston Effect in Subway Stations. Hindawi Publishing Corporation, Advances in Mechanical Engineering, Volume 2013, Article ID 950205, 7 pages. http://dx.doi.org/10.1155/2013/950205.

H. Ingason, M. Kumm, D. Nilsson, A. Lönnermark, A. Claesson, Y.Z. Li, K. Fridolf, R. Åkerstedt, H. Nyman, T. Dittmer, R. Forsén, B. Janzon, G. Meyer, A. Bryntse, T. Carlberg, L. Newlove-Eriksson, and A. Palm. The METRO Project. Report, Mälardalen University, 2012.

O. Lanchava, N. Ilias, G. Nozadze, S. Radu, R. Moraru, Z. Khokerashvili, N. Arudashvili. The Impact of the Piston Effect on the Technological Characteristics of Ventilation in the Subway Tunnels. SESAM 2017 “International Symposium on Occupational Health and Safety, Bucharest, Romania, 2017.

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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ON THE EVALUATION OF AIR FLOWS CAUSED BY A PISTON EFFECT IN SUBWAY TUNNELS

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