Work

Experimental Study of the Influence of an Asymmetric Tunnel Structure on the Maximum Ceiling Temperature in a V-Shaped Tunnel Fire

Year: 2024

Type: article

Abstract: The smoke diffusion characteristics in an asymmetric V-shaped tunnel located at the slope change point were studied by experiments in a 1/20 small-scale tunnel. The influences of the slope composition of the V-shaped tunnel and fire heat release rate (fire HRR) on the fire-induced airflow velocity in the tunnel and maximum ceiling temperature rise were the focuses. The results show that due to the height difference between the two ports of the asymmetric tunnel, the resulting thermal pressure difference between the two sides of the tunnel drives the smoke to flow toward the large slope side and the inlet-induced airflow velocity increases with the increases in the slope difference and the HRR. The dimensionless inlet-induced airflow velocity v* is proportional to φ10.525H*0.634φ1−0.223Q*0.288. The maximum ceiling temperature rise increases with the increase in the HRR and decreases with the slope differences between the two side tunnels. An empirical model of the dimensionless induced airflow speed and the maximum temperature rise was proposed.

Source: Fire

DOI: 10.3390/fire7120483

Authors: Qiwei Dong, Junmei Li, Yanfeng Li, Huimin Lu, Hengxuan Zhao

Institutions: Beijing University of Technology, Beijing Municipal Engineering Design and Research Institute (China)

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: $2,728

Funder: Natural Science Foundation of Beijing Municipality