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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

传热学

DOI: 10.1615/HeatTransRes.2016010488
pages 989-1011

A NEW SEMIEMPIRICAL MODEL FOR THE MAXIMUM TEMPERATURE UNDER THE CEILING IN URBAN TRAFFIC LINK TUNNEL FIRES

Sicheng Li
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China; Department of Fire Command, The Chinese People's Armed Police Force Academy, Lang fang, Hebei, 065000, China
W. Wang
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
Y. H. Zhao
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
X. G. Dong
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China

ABSTRACT

The Urban Traffic Link Tunnel (UTLT) is an innovative underground transportation system for the modern metropolis, typically consisting of a main tunnel and several linked tunnels. To provide proper fire protection to the UTLT structure, the maximum temperature beneath the ceiling needs to be determined. However, as the effective height of the UTLT is lower than that of a normal tunnel, the maximum temperatures under the UTLT ceiling are different from those in normal tunnels. A theoretical analysis and CFD simulation were performed in this work to estimate the maximum temperature under the ceiling in UTLT. The smoke temperatures at 0.2 m under the ceiling of the UTLT were computed for different heat release rates, longitudinal ventilation velocities, and tunnel heights. Based on the simulation results, a new semiempirical model for the maximum temperature under the ceiling during UTLT fires has been developed. The comparison of the new model predictions with experimental data indicates that the model can predict experimental results fairly well and is suitable for the UTLT fire protection design.


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