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A theoretical and experimental study on the buoyancy-driven smoke flow in a tunnel with vertical shafts
RISE - Research Institutes of Sweden, Safety and Transport, Safety. Chongqing University, China.
Chongqing University, China.
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-9340-6768
Chongqing University, China.
2019 (English)In: International journal of thermal sciences, ISSN 1290-0729, E-ISSN 1778-4166, Vol. 141, p. 33-46Article in journal (Refereed) Published
Abstract [en]

In this study, a series of small-scale experiments was carried out in a model scale tunnel with dimensions of 20 m (Length) × 2 m (Width) × 1 m (Height) to investigate the characteristics of buoyancy-driven smoke flow in a tunnel with vertical shafts. Different shaft settings and four different longitudinal ventilation velocities were tested in the experiments. A theoretical model for the mass flow rate of buoyancy-driven smoke flow in the shaft was developed and validated. The gas temperature along the tunnel ceiling and smoke stratification were subsequently analyzed and discussed. The results showed that more shafts, greater shaft heights and greater shaft cross sectional areas can significantly increase the smoke extraction rate, and the total smoke mass flow rate in the shafts increases with the increasing ventilation velocity. The local pressure loss coefficient at the shaft inlet may not be a fixed value. An average value of 1.0 for this coefficient was recommended for engineering estimation and design of rectangular-shaped natural shafts. The presence of vertical shaft is beneficial to the smoke stratification and could increase the height of the smoke layer interface, especially for the downstream of the shaft.

Place, publisher, year, edition, pages
2019. Vol. 141, p. 33-46
Keywords [en]
Buoyant flow, Smoke extraction rate, Smoke stratification, Tunnel fire, Vertical shaft, Buoyancy, Extraction, Mass transfer, Smoke detectors, Ventilation, Extraction rate, Tunnel fires, Smoke
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-38254DOI: 10.1016/j.ijthermalsci.2019.03.021Scopus ID: 2-s2.0-85063383577OAI: oai:DiVA.org:ri-38254DiVA, id: diva2:1301632
Note

Funding details: China Scholarship Council; Funding text 1: The authors would like to acknowledge Tunnel and Underground Safety Center (TUSC) at RISE for the financial support to the study. The experimental work was financed by Swedish Fire Research Board (Brandforsk) which is gratefully acknowledged. Thanks to Bengt Hägglund and Per Werling at Swedish Defence Research Agency (FOI) for providing the facility and the assistance in conducting the tests. Shengzhong Zhao would also like to acknowledge the financial support by China Scholarship Council under Program for Ph.D. Student Overseas Study Scholarship 2017.

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02Bibliographically approved

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