Work

A Numerical Study on the Smoke Diffusion Characteristics in Tunnel Fires During Construction Under Pressed-In Ventilation

Year: 2025

Type: article

Abstract: Pressed-in ventilation provides the possibility of implementing fire smoke control in tunnels during construction. In this study, the impact of the velocity at the air duct outlet, the heat release rate (HRR), and the tunnel geometry on the longitudinal temperature decay of the ceiling (ΔT) and smoke’s back-layering length (SBL) is investigated, using a reduced-scale experiment and the Fire Dynamics Simulator (FDS, version 6.7.6). The results indicate that an increase in the velocity at the air duct outlet and a decrease in the HRR lead to a reduction in the value of both ΔT and SBL in the main tunnel. Predictive models for the dimensionless longitudinal temperature decay of the ceiling and the dimensionless SBL are proposed. Near the fire source, the predicted SBL is relatively high due to thermal radiation. The research results provide valuable references for preventing tunnel fires during construction.

Source: Fire

DOI: 10.3390/fire8120480

Authors: Longyue Li, Yanfeng Li, Kangyue Wang, Lin Xu, Mingxuan Qiu, Mengzhen Liu

Institutions: Beijing University of Technology, Shandong Jianzhu University

Language: English

Topic: Fire dynamics and safety research

Subfield: Safety, Risk, Reliability and Quality

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funder: Natural Science Foundation of Beijing Municipality